University of Edinburgh
Dye Sensitized Solar Cells with Cobalt and Iodine-Based Electrolyte: The Role of Thiocyanate-Free Ruthenium SensitizersKuan-Lin Wu,a,? Yue Hu,b,? Chun-Tien Chao,a Ya-Wen Yang,a Ting-Yun Hsiao,c Neil Robertson,*,b and Yun Chi,*,a [a] Department of Chemistry and Low Carbon Energy Research Center, National Tsing Hua University, Hsinchu 30013, Taiwan; E-mail: ychi@mx.nthu.edu.tw[b] EaStCHEM, School of Chemistry, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh EH9 3 JJ (UK); E-mail: Neil.Robertson@ed.ac.uk[c] Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan? K-L W and Y H contributed equally to this work.TOC Illustration:AbstractThree isomeric Ru(II) metal complexes with distinctively oriented tpiq ancillary chelates, TFRS-80a, 80b and 80c, were prepared from the condensation of Ru(4,4'-diethoxycarbonyl-?2,2'-bipyridine)(p-cymene)Cl with tpiqH, i.e. 6-(5-(2,6-bis(hexyloxy)phenyl)thiophen-?2-yl)-1-(3-(trifluoromethyl)-?1H-pyrazol-?5-yl)?isoquinoline. Photophysical and electrochemical investigations, together with DFT and TD-DFT calculations, allowed a comprehensive understanding of their basic properties in both solution state and on TiO2 surface. DSC cells with both an ultra-thin layer of transparent TiO2 (3.6 μm) and I?/I3? electrolyte were fabricated, for which the symmetric sensitizers TFRS-80a and 80c showed better performances (η = 8.37 and 8.26 %) over that of the asymmetric counterpart TFRS-80b (η = 5.55 %), the latter suffered from poor dye loading and consequently lowered JSC and VOC. In sharp contrast, all DSC cells with [Co(phen)3]2+/3+ electrolyte gave superior efficiencies (η = 8.36 9.06 %), for which the thiocyanate-free architecture, the improved light harvesting capability, and the possession of conjugated and bulky 5-(2,6-bis(hexyloxy)?phenyl)thiophen-2-yl functional moieties are three primary factors governing the observed results.IntroductionPhotovoltaic technologies are pivotal to the future progression of human societies, among which dye-sensitized solar cells (DSCs)PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5Hb25jYWx2ZXM8L0F1dGhvcj48WWVhcj4yMDA4PC9ZZWFy
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ADDIN EN.CITE.DATA 1 have already achieved a highest conversion efficiency of 13%, using Zn(II) porphyrin sensitizers together with Co2+/3+ electrolytes.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NYXRoZXc8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA 2 A typical DSC consists of a dye that self-assembles onto a mesoporous TiO2 photoanode. The sensitizers can rapidly inject electrons into the conduction band of the TiO2, following excitation by incident solar irradiation. The oxidized sensitizers are then regenerated by redox couples in the electrolyte and become available for the next round of light harvesting, electron injection and reduction. It is believed that better sensitizers would offer a leap in improvement in the overall efficiency of DSC anic donor-acceptor dyes with cyanoacrylic anchor are highly competitive due to their potentially simple design, synthetic flexibility and scalability.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NaXNocmE8L0F1dGhvcj48WWVhcj4yMDA5PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA 3 However, their disadvantage is the poor stability under the combined effects of UV irradiation and water content in the electrolyte, which triggers both the reversion of cyanoacrylic acid to aldehyde, ADDIN EN.CITE <EndNote><Cite><Author>Chen</Author><Year>2013</Year><RecNum>2109</RecNum><DisplayText><style face="superscript">4</style></DisplayText><record><rec-number>2109</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1371633212">2109</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Chen, Cheng</author><author>Yang, Xichuan</author><author>Cheng, Ming</author><author>Zhang, Fuguo</author><author>Sun, Licheng</author></authors></contributors><titles><title>Degradation of Cyanoacrylic Acid-Based Organic Sensitizers in Dye-Sensitized Solar Cells</title><secondary-title>ChemSusChem</secondary-title></titles><periodical><full-title>ChemSusChem</full-title></periodical><pages>1270</pages><volume>6</volume><number>7</number><dates><year>2013</year></dates><urls></urls></record></Cite></EndNote>4 and photoisomerization of acrylic C=C bond. ADDIN EN.CITE <EndNote><Cite><Author>Zietz</Author><Year>2014</Year><RecNum>2399</RecNum><DisplayText><style face="superscript">5</style></DisplayText><record><rec-number>2399</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1389865712">2399</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Zietz, Burkhard</author><author>Gabrielsson, Erik</author><author>Johansson, Viktor</author><author>El-Zohry, Ahmed M.</author><author>Sun, Licheng</author><author>Kloo, Lars</author></authors></contributors><titles><title>Photoisomerization of the cyanoacrylic acid acceptor group - a potential problem for organic dyes in solar cells</title><secondary-title>Phys. Chem. Chem. Phys.</secondary-title></titles><periodical><full-title>Phys. Chem. Chem. Phys.</full-title></periodical><pages>2251-2255</pages><volume>16</volume><number>6</number><dates><year>2014</year></dates><publisher>The Royal Society of Chemistry</publisher><isbn>1463-9076</isbn><work-type>10.1039/C3CP54048K</work-type><urls><related-urls><url> Recently, a class of organic dyes bearing benzoic acid have ingeniously avoided these degradation pathways and, in combination with filling defects on the TiO2 surface to attenuate interfacial charge recombination, showed excellent efficiency of > 12% with Co2+/3+ electrolytes.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5aaGFuZzwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+PFJl
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ADDIN EN.CITE.DATA 7 hence, they have been subjected to advanced studies aimed towards possible commercialization. ADDIN EN.CITE <EndNote><Cite><Author>Hinsch</Author><Year>2014</Year><RecNum>2554</RecNum><DisplayText><style face="superscript">8</style></DisplayText><record><rec-number>2554</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1394251337">2554</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Hinsch, Andreas</author><author>Veurman, Welmoed</author><author>Brandt, Henning</author><author>Flarup?Jensen, Katrine</author><author>Mastroianni?, Simone</author></authors></contributors><titles><title>Status of Dye Solar Cell Technology as a Guideline for Further Research</title><secondary-title>ChemPhysChem</secondary-title></titles><periodical><full-title>ChemPhysChem</full-title></periodical><pages>1076-1087</pages><volume>15</volume><number>6</number><keywords><keyword>dyes/pigments</keyword><keyword>electrochemistry</keyword><keyword>mesoscopic principle</keyword><keyword>photochemistry</keyword><keyword>solar cells</keyword></keywords><dates><year>2014</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1439-7641</isbn><urls><related-urls><url> On the other hand, there are growing studies on Ru(II) sensitizers devoid of thiocyanate ligand, among which van Koten and coworkers have utilized cyclometalate ancillaries to construct the first class of thiocyanate-free Ru(II) sensitizers, albeit of lower efficiency. ADDIN EN.CITE <EndNote><Cite><Author>Wadman</Author><Year>2007</Year><RecNum>1509</RecNum><DisplayText><style face="superscript">9</style></DisplayText><record><rec-number>1509</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1323608622">1509</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wadman, Sipke H.</author><author>Kroon, Jan M.</author><author>Bakker, Klaas</author><author>Lutz, Martin</author><author>Spek, Anthony L.</author><author>van Klink, Gerard P. M.</author><author>van Koten, Gerard</author></authors></contributors><titles><title>Cyclometalated ruthenium complexes for sensitizing nanocrystalline TiO2 solar cells</title><secondary-title>Chem. Commun.</secondary-title></titles><periodical><full-title>Chem. Commun.</full-title></periodical><pages>1907</pages><number>19</number><dates><year>2007</year></dates><urls></urls></record></Cite><Cite><Author>Wadman</Author><Year>2010</Year><RecNum>1510</RecNum><record><rec-number>1510</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1323608655">1510</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wadman, Sipke H.</author><author>Kroon, Jan M.</author><author>Bakker, Klaas</author><author>Havenith, Remco W. A.</author><author>van Klink, Gerard P. M.</author><author>van Koten, Gerard</author></authors></contributors><titles><title>Cyclometalated Organoruthenium Complexes for Application in Dye-Sensitized Solar Cells. </title><secondary-title>Organometallics</secondary-title></titles><periodical><full-title>Organometallics</full-title></periodical><pages>1569</pages><volume>29</volume><number>7</number><dates><year>2010</year></dates><urls></urls></record></Cite></EndNote>9 However, their true potential was only realized after Gr?tzel, who employed the electron deficient 2,4-difluorophenyl pyridinato chelate to construct the sensitizer YE05, showed a prominent conversion efficiency (η) of 10.1 % at standard AM 1.5 sunlight. ADDIN EN.CITE <EndNote><Cite><Author>Bessho</Author><Year>2009</Year><RecNum>660</RecNum><DisplayText><style face="superscript">10</style></DisplayText><record><rec-number>660</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="0">660</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Bessho, Takeru</author><author>Yoneda, Eiji</author><author>Yum, Jun-Ho</author><author>Guglielmi, Matteo</author><author>Tavernelli, Ivano</author><author>Imai, Hachiro</author><author>Rothlisberger, Ursula</author><author>Nazeeruddin, Mohammad K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>New Paradigm in Molecular Engineering of Sensitizers for Solar Cell Applications</title><secondary-title>J. Am. Chem. Soc.</secondary-title></titles><periodical><full-title>J. Am. Chem. Soc.</full-title></periodical><pages>5930</pages><volume>131</volume><number>16</number><keywords><keyword>YE05</keyword></keywords><dates><year>2009</year></dates><urls></urls></record></Cite><Cite><Author>De Angelis</Author><Year>2010</Year><RecNum>949</RecNum><record><rec-number>949</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="0">949</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>De Angelis, Filippo</author><author>Fantacci, Simona</author><author>Selloni, Annabella</author><author>Nazeeruddin, Mohammad K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>First-Principles Modeling of the Adsorption Geometry and Electronic Structure of Ru(II) Dyes on Extended TiO2 Substrates for Dye-Sensitized Solar Cell Applications</title><secondary-title>J. Phys. Chem. C</secondary-title></titles><periodical><full-title>J. Phys. Chem. C</full-title></periodical><pages>6054</pages><volume>114</volume><number>13</number><dates><year>2010</year></dates><urls></urls></record></Cite></EndNote>10 Later, cyclometalates and other ancillaries were systematically employed by Berlinguette in attempts to expand this class of Ru(II) sensitizers.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5Cb21iZW48L0F1dGhvcj48WWVhcj4yMDExPC9ZZWFyPjxS
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ADDIN EN.CITE.DATA 14 to replace the aforementioned cyclometalates. Scheme 1 depicts three Ru(II) sensitizers with trans-substituted pyrazolate fragments, all derived from their parent complex TFRS-1, showing respectable η of ≥10 % using I?/I3? based electrolyte for TFRS-52, ADDIN EN.CITE <EndNote><Cite><Author>Wu</Author><Year>2013</Year><RecNum>253</RecNum><DisplayText><style face="superscript">15</style></DisplayText><record><rec-number>253</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="0">253</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wu, Kuan-Lin</author><author>Ku, Wan-Ping</author><author>Clifford, John N.</author><author>Palomares, Emilio</author><author>Ho, Shu-Te</author><author>Chi, Yun</author><author>Liu, Shih-Hung</author><author>Chou, Pi-Tai</author><author>Nazeeruddin, Mohammad K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Harnessing the open-circuit voltage via a new series of Ru(II) sensitizers bearing (iso-)quinolinyl pyrazolate ancillaries</title><secondary-title>Energy Environ. Sci.</secondary-title></titles><pages>859</pages><volume>6</volume><number>3</number><dates><year>2013</year></dates><urls></urls></record></Cite><Cite><Author>Wang</Author><Year>2013</Year><RecNum>243</RecNum><record><rec-number>243</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="0">243</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wang, Sheng-Wei</author><author>Wu, Kuan-Lin</author><author>Ghadiri, Elham</author><author>Lobello, Maria Grazia</author><author>Ho, Shu-Te</author><author>Chi, Yun</author><author>Moser, Jacques-E.</author><author>De Angelis, Filippo</author><author>Gr?tzel, Michael</author><author>Nazeeruddin, Mohammad K. </author></authors></contributors><titles><title>Engineering of thiocyanate-free Ru(II) sensitizers for high efficiency dye-sensitized solar cells</title><secondary-title>Chem. Sci.</secondary-title></titles><pages>2423</pages><volume>4</volume><number>6</number><dates><year>2013</year></dates><urls></urls></record></Cite></EndNote>15 and η of 8.71 % using [Co(bpy)3]2+/3+ electrolyte for TFRS-42, respectively. ADDIN EN.CITE <EndNote><Cite><Author>Wu</Author><Year>2014</Year><RecNum>301</RecNum><DisplayText><style face="superscript">16</style></DisplayText><record><rec-number>301</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1406789229">301</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wu, Kuan-Lin</author><author>Clifford, John N.</author><author>Wang, Sheng-Wei</author><author>Aswani, Yella</author><author>Palomares, Emilio</author><author>Lobello, Maria Grazia</author><author>Mosconi, Edoardo</author><author>De Angelis, Filippo</author><author>Ku, Wan-Ping</author><author>Chi, Yun</author><author>Nazeeruddin, Mohammad K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Thiocyanate-free Ru(II) sensitizers for dye-sensitized solar cells based on the cobalt redox couples</title><secondary-title>ChemSusChem</secondary-title></titles><periodical><full-title>ChemSusChem</full-title></periodical><pages>DOI: 10.1002/cssc.201402030</pages><dates><year>2014</year></dates><urls></urls></record></Cite></EndNote>16 It is notable that TFRS-42 exhibited the highest η for the Co2+/3+ electrolytic system due to its charge neutrality, greater spatial congestion and absence of thiocyanate ligands, all of which are essential for reducing the recombination across the interface of TiO2 and electrolyte.Scheme 1. Structures of sensitizers TFRS-1, 2, 42 and 52.These TFRS sensitizers were prepared by coupling of Ru(diethyl 2,2'-bipyridine-4,4'-dicarboxylate)(p-cymene)Cl with two equiv. of chelating pyrazole, followed by hydrolysis in basic media. In the absence of any regioselectivity, a maximum of three isomers would be expected, for which the other two structures would differ from all the trans-substituted TFRS dyes shown in Scheme 1 by reshuffling the orientation of the azolate chelates. ADDIN EN.CITE <EndNote><Cite><Author>Hu</Author><Year>2014</Year><RecNum>296</RecNum><DisplayText><style face="superscript">17</style></DisplayText><record><rec-number>296</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1400731359">296</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Hu, Fa-Chun</author><author>Wang, Sheng-Wei</author><author>Chi, Yun</author><author>Robertson, Neil</author><author>Hewat, Tracy</author><author>Hu, Yue</author><author>Liu, Shih-Hung</author><author>Chou, Pi-Tai</author><author>Yang, Po-Fan</author><author>Lin, Hao-Wu</author></authors></contributors><titles><title>Geometrical Isomerism of RuII Dye-Sensitized Solar Cell Sensitizers and Effects on Photophysical Properties and Device Performances</title><secondary-title>ChemPhysChem</secondary-title></titles><periodical><full-title>ChemPhysChem</full-title></periodical><pages>1207-1215</pages><volume>15</volume><number>6</number><keywords><keyword>density functional theory</keyword><keyword>dye-sensitized solar cells</keyword><keyword>pyrazolates</keyword><keyword>ruthenium</keyword><keyword>spectroelectrochemistry</keyword></keywords><dates><year>2014</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1439-7641</isbn><urls><related-urls><url> Herein, we wish to report the detailed study on the system where all three isomeric sensitizers, TFRS-80a, 80b and 80c, have been isolated and characterized. These sensitizers are derived from a π-conjugated tpiqH chelate, i.e. 6-(5-(2,6-bis(hexyloxy)phenyl)thiophen-?2-yl)-1-(3-?(trifluoromethyl)-?1H-pyrazol-?5-yl)?isoquinoline, such that their higher absorptivity and potential for fabrication of DSCs with high η of 9.06 % triggered the full determination of their photophysical and electrochemical properties and structure-efficiency relationship of both I?/I3? and Co2+/3+ based dye-sensitized solar cells.Scheme 2. Structural drawings of tpiqH chelate and isomeric sensitizers TFRS-80a, 80b and 80c.Results and discussionSyntheses. The pyrazolate ancillary, 5-(2,6-bis(hexyloxy)phenyl)thiophen-?2-yl substituted tpiqH chelate, was selected for this investigation due to the large π-conjugation expected for both the isoquinolinyl fragment and thienyl appendage at the C6 position, resulting in a combined hyperchromic effect and bathochromic shift in the recorded UV/Vis spectra. 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ADDIN EN.CITE.DATA 18This chelating ancillary is treated with the metal reagent Ru(4,4'-diethoxycarbonyl-?2,2'-bipyridine)(p-cymene)Cl and the basic promoter KOAc in xylenes, according to the established protocol. All three isomeric products were separated using SiO2 column chromatography, after executing two consecutive elutions using a 1:4 mixture of ethyl acetate and hexane, followed by employment of a 1:20 mixture of ethyl acetate and CH2Cl2. Subsequent hydrolysis of each compound in NaOH-water-acetone mixture afford the carboxylic sensitizers TFRS-80a, 80b and 80c in 32%, 11% and 15% yields, respectively. It is notable that these isomers represent formation of all three possible structural isomeric Ru(II) based complexes, for which their structural identification can be achieved according to their 1H and 19F NMR spectral pattern. Of particular importance is the 19F NMR spectral data, which unambiguous confirmed the symmetric or asymmetric nature of TFRS-80a/80c and TFRS-80b by revealing a single 19F NMR signal and two signals of equal intensity, respectively.Photophysical and electrochemical behavior. The absorption spectra of TFRS-80a, 80b and 80c were measured in DMF and are depicted in Figure 1, while pertinent numerical data are summarized in Table 1. As can be seen, all sensitizers show strong absorption at 360 nm with extinction coefficient (ε) falling in the range of 5.1 6.2 104 M-1·cm-1, which is apparently due to the ligand centered ππ* transition. In addition, there is another lower energy, broad transition centered at 525 nm, with a slightly lower extinction coefficient of 3.2 3.9 104 M-1·cm-1. Furthermore, the recorded extinction coefficients are all markedly higher than the corresponding band of N719 (1.4 104 M-1·cm-1) and relevant MLCT band of C101 (1.75 104 M-1·cm-1) ADDIN EN.CITE <EndNote><Cite><Author>Gao</Author><Year>2008</Year><RecNum>503</RecNum><DisplayText><style face="superscript">19</style></DisplayText><record><rec-number>503</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="0">503</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Gao, Feifei</author><author>Wang, Yuan</author><author>Shi, Dong</author><author>Zhang, Jing</author><author>Wang, Mingkui</author><author>Jing, Xiaoyan</author><author>Humphry-Baker, Robin</author><author>Wang, Peng</author><author>Zakeeruddin, Shaik M.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Enhance the Optical Absorptivity of Nanocrystalline TiO2 Film with High Molar Extinction Coefficient Ruthenium Sensitizers for High Performance Dye-Sensitized Solar Cells</title><secondary-title>J. Am. Chem. Soc.</secondary-title></titles><periodical><full-title>J. Am. Chem. Soc.</full-title></periodical><pages>10720</pages><volume>130</volume><number>32</number><dates><year>2008</year></dates><urls></urls></record></Cite></EndNote>19 and TG6 (2.3 104 M-1·cm-1), ADDIN EN.CITE <EndNote><Cite><Author>Matar</Author><Year>2008</Year><RecNum>533</RecNum><DisplayText><style face="superscript">20</style></DisplayText><record><rec-number>533</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="0">533</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Matar, Farah</author><author>Ghaddar, Tarek H.</author><author>Walley, Kate</author><author>DosSantos, Tracy</author><author>Durrant, James R.</author><author>O'Regan, Brian</author></authors></contributors><titles><title>A new ruthenium polypyridyl dye, TG6, whose performance in dye-sensitized solar cells is surprisingly close to that of N719, the "dye to beat" for 17 years</title><secondary-title>J. Mater. Chem.</secondary-title></titles><periodical><full-title>J. Mater. Chem.</full-title></periodical><pages>4246</pages><volume>18</volume><number>36</number><dates><year>2008</year></dates><urls></urls></record></Cite></EndNote>20 confirming the excellent light harvesting capability in the visible region. The comparisons of experimental UV-visible spectra with the computational simulated oscillator strengths are presented in Figures S1-S3 of electronic supporting information.DFT and TD-DFT calculations using a DMF polarizable continuum model were carried out, showing that in each case the LUMO is based upon the dicarboxy bipyridine as expected, and that the HOMO is distributed across the Ru orbitals and the entire tpiq ligand (Figure 2). In particular, we note that this conjugation extends to the thienyl and 2,6-dihexyloxylphenyl fragments in keeping with the intended ligand design and ensuring effective charge separation between electrons injected into the TiO2 and the positive charge on the oxidized dye. It is also apparent that the delocalization of the HOMO differs across the isomer series, with only that of TFRS-80a spread across both tpiq ligands, presumably accounting for the lower HOMO energy for this dye. The TD-DFT calculations reproduced the transition energies of the charge-transfer bands moderately well, with the results sufficient to give insight into the orbital origins of transitions. The 525 nm charge transfer band in each case (calculated at around 480 nm) originates from a mixture of the Ru(II) metal core and the pyrazolate to dicarboxy bipyridine, i.e. a mixing of MLCT and LLCT transitions, in a way analogous to the assignment made for other TFRS sensitizers. ADDIN EN.CITE <EndNote><Cite><Author>Wu</Author><Year>2010</Year><RecNum>252</RecNum><DisplayText><style face="superscript">12b</style></DisplayText><record><rec-number>252</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="0">252</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wu, Kuan-Lin</author><author>Hsu, Hui-Chu</author><author>Chen, Kellen</author><author>Chi, Yun</author><author>Chung, Min-Wen</author><author>Liu, Wei-Hsin</author><author>Chou, Pi-Tai</author></authors></contributors><titles><title>Development of thiocyanate-free, charge-neutral Ru(II) sensitizers for dye-sensitized solar cells</title><secondary-title>Chem. Commun.</secondary-title></titles><periodical><full-title>Chem. Commun.</full-title></periodical><pages>5124</pages><volume>46</volume><number>28</number><dates><year>2010</year></dates><urls></urls></record></Cite></EndNote>12bIn the context of DSC application, further enhancements in absorption were observed upon depositing these sensitizers on the TiO2 surface, such that all of the absorptions broadened substantially, the recorded spectra showed an absence of the semi-transparent region centered at 430 nm recorded in DMF solution, as well as red-shifting of the lowest energy absorption peak maxima to 700 nm. We speculate that such a broadened spectral profile is beneficial to the competitive harvesting of shorter wavelength irradiation,PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GYW48L0F1dGhvcj48WWVhcj4yMDExPC9ZZWFyPjxSZWNO
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ADDIN EN.CITE.DATA 21 particular for DSC devices that utilize the I–/I3– based electrolytes.Cyclic voltammetry was conducted to reveal the variation in electrochemical potentials among the three isomers, and to verify whether the oxidation potential of the ground state (E°'ox) matches the redox potential of the redox mediators. As shown in Table 1, the oxidation potential of the isomers follows the trend of TFRS-80c < 80b < 80a which are reproduced well by the calculated HOMO energies shown by the computational results (see Table S1-S3). The E°'ox is attributed to the Ru(II) metal oxidation, and appeared in the range of 0.78 0.87 V (vs. NHE, normal hydrogen electrode), all more positive than that of I?/I3? redox couple (Eo = ca. 0.4 V) and the redox potential of the [Co(phen)3]2+/3+ (Eo = ca. 0.62 V vs. NHE). The limited variation in E°'ox potentials in these studies can be attributed to the identical local coordination environment around the central Ru(II) atom, with the small differences attributed to different amounts of delocalization and stabilization of the HOMO. In addition, the zero-zero transition energy (E0-0) or band gap was determined from the intersection of the absorption and normalized emission spectra. From this, the excited-state oxidation potential (E°'*) is estimated from the difference of E°'ox and E0-0, from which the calculated values of ?1.00 ?1.09 V (vs. NHE) were obtained. Since all of the E°'* are significantly more negative than the conduction band edge of the TiO2 electrode (ECB ?0.2 and ?0.5 V vs. NHE), ADDIN EN.CITE <EndNote><Cite><Author>Liang</Author><Year>2013</Year><RecNum>2014</RecNum><DisplayText><style face="superscript">22</style></DisplayText><record><rec-number>2014</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1364753629">2014</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Liang, Mao</author><author>Chen, Jun</author></authors></contributors><titles><title>Arylamine organic dyes for dye-sensitized solar cells</title><secondary-title>Chem. Soc. Rev.</secondary-title></titles><periodical><full-title>Chem. Soc. Rev.</full-title></periodical><pages>3453</pages><volume>42</volume><number>8</number><dates><year>2013</year></dates><urls></urls></record></Cite><Cite><Author>Stalder</Author><Year>2014</Year><RecNum>3054</RecNum><record><rec-number>3054</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1402840059">3054</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Stalder, Romain</author><author>Xie, Dongping</author><author>Islam, Ashraful</author><author>Han, Liyuan</author><author>Reynolds, John R.</author><author>Schanze, Kirk S.</author></authors></contributors><titles><title>Panchromatic Donor–Acceptor–Donor Conjugated Oligomers for Dye-Sensitized Solar Cell Applications</title><secondary-title>ACS Appl. Mater. Int.</secondary-title></titles><periodical><full-title>ACS Appl. Mater. Int.</full-title></periodical><pages>8715-8722</pages><volume>6</volume><number>11</number><dates><year>2014</year><pub-dates><date>2014/06/11</date></pub-dates></dates><publisher>American Chemical Society</publisher><isbn>1944-8244</isbn><urls><related-urls><url> this confirms that efficient electron injection from the excited sensitizer to the conduction band of TiO2 should occur.To probe the longer-term stability of the dye oxidized state we carried out spectroelectrochemical studies of each dye in solution upon oxidation (Figs. S4 - S6). It was apparent that TFRS-80c showed the best isosbestic points during the oxidation and was more fully returned to the starting spectrum upon reduction in comparison with either TFRS-80a or TFRS-80b. We have previously suggested the possibility of some isomerization within this type of dye series upon oxidation, ADDIN EN.CITE <EndNote><Cite><Author>Hu</Author><Year>2014</Year><RecNum>296</RecNum><DisplayText><style face="superscript">17</style></DisplayText><record><rec-number>296</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1400731359">296</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Hu, Fa-Chun</author><author>Wang, Sheng-Wei</author><author>Chi, Yun</author><author>Robertson, Neil</author><author>Hewat, Tracy</author><author>Hu, Yue</author><author>Liu, Shih-Hung</author><author>Chou, Pi-Tai</author><author>Yang, Po-Fan</author><author>Lin, Hao-Wu</author></authors></contributors><titles><title>Geometrical Isomerism of RuII Dye-Sensitized Solar Cell Sensitizers and Effects on Photophysical Properties and Device Performances</title><secondary-title>ChemPhysChem</secondary-title></titles><periodical><full-title>ChemPhysChem</full-title></periodical><pages>1207-1215</pages><volume>15</volume><number>6</number><keywords><keyword>density functional theory</keyword><keyword>dye-sensitized solar cells</keyword><keyword>pyrazolates</keyword><keyword>ruthenium</keyword><keyword>spectroelectrochemistry</keyword></keywords><dates><year>2014</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1439-7641</isbn><urls><related-urls><url> which may also provide an explanation in this case. We note however, that as for previous TFRS-2 and TFRS-52 dyes, the oxidative stability was much higher than we have observed for thiocyanate-containing dyes such as N3. ADDIN EN.CITE <EndNote><Cite><Author>Hu</Author><Year>2014</Year><RecNum>296</RecNum><DisplayText><style face="superscript">17</style></DisplayText><record><rec-number>296</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1400731359">296</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Hu, Fa-Chun</author><author>Wang, Sheng-Wei</author><author>Chi, Yun</author><author>Robertson, Neil</author><author>Hewat, Tracy</author><author>Hu, Yue</author><author>Liu, Shih-Hung</author><author>Chou, Pi-Tai</author><author>Yang, Po-Fan</author><author>Lin, Hao-Wu</author></authors></contributors><titles><title>Geometrical Isomerism of RuII Dye-Sensitized Solar Cell Sensitizers and Effects on Photophysical Properties and Device Performances</title><secondary-title>ChemPhysChem</secondary-title></titles><periodical><full-title>ChemPhysChem</full-title></periodical><pages>1207-1215</pages><volume>15</volume><number>6</number><keywords><keyword>density functional theory</keyword><keyword>dye-sensitized solar cells</keyword><keyword>pyrazolates</keyword><keyword>ruthenium</keyword><keyword>spectroelectrochemistry</keyword></keywords><dates><year>2014</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1439-7641</isbn><urls><related-urls><url> further clarify the influence of the dye structure on the solar cell performance (described in the next section), we carried out electrochemical studies of the dyes bound to mesoporous TiO2 films. Since the electrochemical window used lies entirely within the band gap of the TiO2, the TiO2 remains insulating and the redox occurs via a hole-diffusion process starting from the base of the film where dye is in contact with the FTO electrode. Firstly, we observe excellent reversibility of the redox process for all three isomers (Figs. S7 - S9) with little change between redox cycles 1 to 51 confirming these as stable sensitizers. This observation is different from that of TFRS-2 and 52, for which the asymmetric isomer b is found to be more stable versus the respective isomer a. ADDIN EN.CITE <EndNote><Cite><Author>Hu</Author><Year>2014</Year><RecNum>296</RecNum><DisplayText><style face="superscript">17</style></DisplayText><record><rec-number>296</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1400731359">296</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Hu, Fa-Chun</author><author>Wang, Sheng-Wei</author><author>Chi, Yun</author><author>Robertson, Neil</author><author>Hewat, Tracy</author><author>Hu, Yue</author><author>Liu, Shih-Hung</author><author>Chou, Pi-Tai</author><author>Yang, Po-Fan</author><author>Lin, Hao-Wu</author></authors></contributors><titles><title>Geometrical Isomerism of RuII Dye-Sensitized Solar Cell Sensitizers and Effects on Photophysical Properties and Device Performances</title><secondary-title>ChemPhysChem</secondary-title></titles><periodical><full-title>ChemPhysChem</full-title></periodical><pages>1207-1215</pages><volume>15</volume><number>6</number><keywords><keyword>density functional theory</keyword><keyword>dye-sensitized solar cells</keyword><keyword>pyrazolates</keyword><keyword>ruthenium</keyword><keyword>spectroelectrochemistry</keyword></keywords><dates><year>2014</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1439-7641</isbn><urls><related-urls><url> Moreover, the quantity of dye uptake was observed to be TFRS-80a > c > b, (Table S4) consistent with that observed during DSC fabrication (see below). Furthermore, following previously-described procedures and equations listed in ESI, the maximum observed current and dye concentration were used to calculate a hole-diffusion coefficient for the case of each dye and these were observed to be in the order TFRS-80a > 80b > 80c (4.21, 1.28 and 0.203 x 10-10 cm2s-1 respectively). These values are all 1 - 3 orders of magnitude lower than typical values reported for other Ru and organic dyes.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5MaTwvQXV0aG9yPjxZZWFyPjIwMTE8L1llYXI+PFJlY051
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ADDIN EN.CITE.DATA 23 It seems likely that this arises due to success of the design strategy whereby the 2,6-dihexyloxylphenyl on the tpiq ligand can suppress π-π interactions and avoid aggregation. In addition, the order of the values among the isomers further supports this conclusion, since TFRS-80a, 80b and 80c have respectively zero, one and two tpiq arms in the plane of the surface to minimize dye-dye electronic interactions.Device characteristics. The photovoltaic properties of these sensitizers were examined, for which the details of cell fabrication and data measurements are depicted in the experimental section. All cells were fabricated using 3.6 μm (20 nm) + 3.5 μm (400 nm) of mesoporous TiO2 thin film. The photocurrent-voltage characteristics were summarized in Tables 2 and 3. Three electrolyte solutions were empolyed for these studies; the first (i.e. electrolyte I-A) consisted of 0.6 M 1,2-dimethyl-3-propylimidazolium iodide (DMPII), 0.05 M I2, and 0.5 M t-butylpyridine (TBP) in acetonitrile, while the second (i.e. Co(phen)3]2+/3+ electrolyte Co-phen) and the third (i.e. electrolyte I-B) contained 0.45 M [Co(phen)3][TFSI]2, 0.15 M [Co(phen)3][TFSI]3, 0.15 M LiTFSI, 0.8 M TBP in acetonitrile, as well as 0.45 M DMPII, 0.05 M I2, 0.15 M LiI, 0.8 M TBP in acetonitrile, respectively. The electrolyte I-A possesses no Li+, while both Co-phen and I-B contain 0.15 M of Li+ cation in electrolyte, such that they can provide an intimate comparison between cell characteristics of the cobalt and iodine based redox couples. Comparative studies on cells with both I–/I3– and Co2+/3+ electrolytes are starting to gain momentum, inspired by the recent report that the Co2+/3+ cells have shown promising photostability under full sun solar illumination. ADDIN EN.CITE <EndNote><Cite><Author>Jiang</Author><Year>2014</Year><RecNum>2553</RecNum><DisplayText><style face="superscript">24</style></DisplayText><record><rec-number>2553</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1394250824">2553</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Jiang, Roger</author><author>Anderson, Assaf</author><author>Barnes, Piers R. F.</author><author>Xiaoe, Li</author><author>Law, Chunhung</author><author>O'Regan, Brian C.</author></authors></contributors><titles><title>2000 hours photostability testing of dye sensitised solar cells using a cobalt bipyridine electrolyte</title><secondary-title>J. Mater. Chem. A</secondary-title></titles><periodical><full-title>J. Mater. Chem. A</full-title></periodical><pages>4751-4757</pages><volume>2</volume><number>13</number><dates><year>2014</year></dates><publisher>The Royal Society of Chemistry</publisher><isbn>2050-7488</isbn><work-type>10.1039/C4TA00402G</work-type><urls><related-urls><url> the DSCs using electrolyte I-A, TFRS-80a exhibited a JSC of 12.93 mAcm-2, a VOC of 890 mV, and a fill factor (FF) of 0.727, while TFRS-80c gave performance data of 12.41 mAcm-2, 880 mV and 0.756, respectively. Their overall conversion efficiencies (η) were calculated to be 8.37% and 8.26%, hence both are superior to that obtained for the asymmetric sensitizer TFRS-80b, with JSC = 9.81 mAcm-2, VOC of 780 mV, FF = 0.725 and η = 5.55%). Since the mixture of isomers 80a and 80c can be easily separated from 80b, but separation of 80a and 80c required repeated column chromatography, from the point view of practical application we therefore attempted DSC fabrication using the naturally occurring mixture of TFRS-80a and 80c, for which the recorded characteristics were JSC = 13.12 mAcm-2, VOC of 870 mV, FF = 0.731, and η = 8.34%, respectively. These data (cf. TFRS-80ac) showed no difference from cells fabricated using each of the pure samples, suggesting the retention of all device performances.Figure 3a exhibits the incident photon-to-current conversion efficiency (IPCE) action spectra recorded using I?/I3? electrolyte I-A. The onset of the IPCE spectra of TFRS-80a, 80c, and the mixture of TFRS-80a and 80c are all close to 780 nm, and with excellent IPCE performance in the range from 400 to 560 nm, among which the highest IPCE of 78% is recorded at around 530 nm, while TFRS-80b showed a notably lowered IPCE of only 51% at the same position. Apparently, the symmetrical TFRS-80a and 80c exhibit much better IPCE action spectra as well as superior J–V characteristics, versus those exhibited by the asymmetric stereoisomer 80b. It appears to us that the significantly reduced dye loading of 80b on the TiO2 surface, which not only reduced the absorptivity of 80b on TiO2 (Figure 1) but also increased the charge recombination at the TiO2/electrolyte interfance, is the major contributing factor for the poor overall conversion efficiency detected.Next, the photovoltaic performance of these sensitizers was evaluated by using Co(phen)3]2+/3+ based redox mediator in acetonitrile solution (i.e. Co-phen). A TiO2 blocking layer was pre-deposited on FTO glass using an aqueous TiCl4 solution. This measure is for retarding charge recombination between FTO and the Co2+/3+ mediator in electrolyte. ADDIN EN.CITE <EndNote><Cite><Author>Yum</Author><Year>2014</Year><RecNum>2627</RecNum><DisplayText><style face="superscript">25</style></DisplayText><record><rec-number>2627</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1398232067">2627</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Yum, Jun-Ho</author><author>Moehl, Thomas</author><author>Yoon, Junghyun</author><author>Chandiran, Aravind Kumar</author><author>Kessler, Florian</author><author>Gratia, Paul</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Toward Higher Photovoltage: Effect of Blocking Layer on Cobalt Bipyridine Pyrazole Complexes as Redox Shuttle for Dye-Sensitized Solar Cells</title><secondary-title>J. Phys. Chem. C</secondary-title></titles><periodical><full-title>J. Phys. Chem. C</full-title></periodical><pages>16799-16805</pages><volume>118</volume><number>30</number><dates><year>2014</year></dates><publisher>American Chemical Society</publisher><isbn>1932-7447</isbn><urls><related-urls><url> Interestingly, the DSC device fabricated using TFRS-80c and [Co(phen)3]2+/3+ redox couple afforded the highest performance characteristics of JSC = 14.32 mA/cm2, VOC = 840 mV, and FF = 0.754, corresponding to an overall η = 9.06% under AM 1.5G one sun irradiation. We attribute this to the diaxial arrangement of the isoquinolinyl substituents on the Ru(II) metal complex, on which the bulky 2,6-dialkoxyphenyl group is expected to form a closely packed insulation layer, as they are now lying directly on top of the TiO2 electrode surface. ADDIN EN.CITE <EndNote><Cite><Author>Archer</Author><Year>2012</Year><RecNum>1785</RecNum><DisplayText><style face="superscript">26</style></DisplayText><record><rec-number>1785</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1346394047">1785</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Archer, Stuart</author><author>Weinstein, Julia A.</author></authors></contributors><titles><title>Charge-separated excited states in platinum(II) chromophores: Photophysics, formation, stabilization and utilization in solar energy conversion</title><secondary-title>Coord. Chem. Rev.</secondary-title></titles><periodical><full-title>Coord. Chem. Rev.</full-title></periodical><pages>2530</pages><volume>256</volume><number>21-22</number><dates><year>2012</year></dates><urls></urls></record></Cite><Cite><Author>Li</Author><Year>2013</Year><RecNum>2420</RecNum><record><rec-number>2420</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1389882727">2420</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Li, Lu-Lin</author><author>Diau, Eric Wei-Guang</author></authors></contributors><titles><title>Porphyrin-sensitized solar cells</title><secondary-title>Chem. Soc. Rev.</secondary-title></titles><periodical><full-title>Chem. Soc. Rev.</full-title></periodical><pages>291-304</pages><volume>42</volume><number>1</number><dates><year>2013</year></dates><publisher>The Royal Society of Chemistry</publisher><isbn>0306-0012</isbn><work-type>10.1039/C2CS35257E</work-type><urls><related-urls><url> This spatial arrangement is expected to be very effective in preventing the oxidized Co3+ species from approaching close to the TiO2 surface in comparison with the other isomers 80a and 80b, for which there is at least one 2,6-dialkoxyphenyl group per molecule orientated further away from the TiO2 surface, and cannot be effective in suppressing the charge recombination against the accumulated, oxidized Co3+ metal species. For a further comparison, all sensitizers were subjected to DSC fabrication using the I?/I3? reference electrolyte (i.e. electrolyte I-B) under identical cell parameters. As can be seen, the overall efficiencies span the range 4.80 7.55%, among which the best one is that fabricated using TFRS-80a. In comparison across the different electrolytes, these data remain 1.0% lower than those documented for the cell fabricated using the corresponding sensitizer and the [Co(phen)3]2+/3+ electrolyte Co-phen. For TFRS-80c, the difference increases to approx. 2.0%, which is even greater. Moreover, the DSC device fabricated using TFRS-80b and I?/I3? electrolyte I-B showed the worst overall η of 4.80%. These data are much inferior to those observed for the Co2+/3+ based cell, with performance data of JSC = 13.30 mA/cm2, VOC = 820 mV, and FF = 0.766, corresponding to an overall η = 8.36%. The latter result is probably due to the effective insulating power of this sensitizer against the bulky Co3+ metal species, leading to the more effective suppression of charge recombination. In addition, the lowered efficiencies of all I?/I3? based DSCs can be traced to the inferior VOC, mainly caused by the greater loss-in-potential for the I?/I3? redox couple versus the Co2+/3+ electrolyte. Moreover, the cell efficiency of TFRS-80b is 2.5% lower than those of the symmetric counterparts, i.e. TFRS-80a and TFRS-80c, upon using the I?/I3? based electrolytes I-A and I-B. On the other hand, the TFRS-80b sensitizer showed a much smaller difference of 0.7 % in efficiency upon switching to Co2+/3+ electrolyte, compared with the best TFRS-80c. Since all of these sensitizers have essentially identical spectroscopic and electrochemical properties, this large variation can only be explained by the inferior dye-loading for TFRS-80b that generated a larger number of voids on the TiO2 surface. Accordingly, the I3? ion is much smaller and can penetrate much deeper into the dye layer versus that of Co2+/3+ electrolyte, giving much greater charge recombination and the greater difference in efficiencies.Figure 3b exhibits the incident photon-to-current conversion efficiency (IPCE) action spectra recorded using the electrolytes Co-phen and I-B. 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ADDIN EN.CITE.DATA 27 This phenomenon is probably due to the poor dye regeneration efficiencies caused by the diminishing of the overpotential for dye regeneration.For a closer comparison, the best recorded efficiency of TFRS-80 series obtained in this study (9.06 %) is slightly higher than that of recently reported tris-heteroleptic Ru(II) sensitizers with 2’,6’-dimethoxy-2,3’-bipyridine cyclometalate (η = 8.6 %). ADDIN EN.CITE <EndNote><Cite><Author>Polander</Author><Year>2013</Year><RecNum>2160</RecNum><DisplayText><style face="superscript">27a</style></DisplayText><record><rec-number>2160</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1375093262">2160</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Polander, Lauren E.</author><author>Yella, Aswani</author><author>Curchod, Basile F. E.</author><author>Ashari, Astani Negar</author><author>Teuscher, Joel</author><author>Scopelliti, Rosario</author><author>Gao, Peng</author><author>Mathew, Simon</author><author>Moser, Jacques-E.</author><author>Tavernelli, Ivano</author><author>Rothlisberger, Ursula</author><author>Gratzel, Michael</author><author>Nazeeruddin, Md. Khaja</author><author>Frey, Julien </author></authors></contributors><titles><title>Towards Compatibility between Ruthenium Sensitizers and Cobalt Electrolytes in Dye-Sensitized Solar Cells</title><secondary-title>Angew. Chem. Int. Ed.</secondary-title></titles><periodical><full-title>Angew. Chem. Int. Ed.</full-title></periodical><pages>8731</pages><volume>52</volume><number>33</number><dates><year>2013</year></dates><urls></urls></record></Cite></EndNote>27a In turn, both data are superior to the thiocyanate-free Ru(II) sensitizer with ppy-(CF3)2 cyclometalate (η = 5.5 %), ADDIN EN.CITE <EndNote><Cite><Author>Bomben</Author><Year>2011</Year><RecNum>1434</RecNum><DisplayText><style face="superscript">11a</style></DisplayText><record><rec-number>1434</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1315623161">1434</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Bomben, Paolo G.</author><author>Gordon, Terry J.</author><author>Schott, Eduardo</author><author>Berlinguette, Curtis P.</author></authors></contributors><titles><title>A Trisheteroleptic Cyclometalated RuII Sensitizer that Enables High Power Output in a Dye-Sensitized Solar Cell</title><secondary-title>Angew. Chem. Int. Ed.</secondary-title></titles><periodical><full-title>Angew. Chem. Int. Ed.</full-title></periodical><pages>10682</pages><volume>50</volume><number>45</number><dates><year>2011</year></dates><urls></urls></record></Cite></EndNote>11a and traditional thiocyanate-containing Ru(II) sensitizers, such as: N719 (η = 1.8 %) and Z907 (η = 6.5 %), ADDIN EN.CITE <EndNote><Cite><Author>Liu</Author><Year>2011</Year><RecNum>1435</RecNum><DisplayText><style face="superscript">27c</style></DisplayText><record><rec-number>1435</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1315835341">1435</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Liu, Yeru</author><author>Jennings, James R.</author><author>Huang, Yao</author><author>Wang, Qing</author><author>Zakeeruddin, Shaik M.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Cobalt Redox Mediators for Ruthenium-Based Dye-Sensitized Solar Cells: A Combined Impedance Spectroscopy and Near-IR Transmittance Study</title><secondary-title>J. Phys. Chem. C</secondary-title></titles><periodical><full-title>J. Phys. Chem. C</full-title></periodical><pages>18847</pages><volume>115</volume><number>38</number><dates><year>2011</year></dates><urls></urls></record></Cite></EndNote>27c Z907 with co-grafting phosphonic acid (η = 8.4 %), ADDIN EN.CITE <EndNote><Cite><Author>Liu</Author><Year>2013</Year><RecNum>3096</RecNum><DisplayText><style face="superscript">27b</style></DisplayText><record><rec-number>3096</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1406791727">3096</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Liu, Yeru</author><author>Jennings, James Robert</author><author>Wang, Xingzhu</author><author>Wang, Qing</author></authors></contributors><titles><title>Significant performance improvement in dye-sensitized solar cells employing cobalt(iii/ii) tris-bipyridyl redox mediators by co-grafting alkyl phosphonic acids with a ruthenium sensitizer</title><secondary-title>Phys. Chem. Chem. Phys.</secondary-title></titles><periodical><full-title>Phys. Chem. Chem. Phys.</full-title></periodical><pages>6170-6174</pages><volume>15</volume><number>17</number><dates><year>2013</year></dates><publisher>The Royal Society of Chemistry</publisher><isbn>1463-9076</isbn><work-type>10.1039/C3CP50998B</work-type><urls><related-urls><url> and C101 (η = 3.6 %) and TT-230 (η = 1.8 %). ADDIN EN.CITE <EndNote><Cite><Author>Kumar</Author><Year>2014</Year><RecNum>2455</RecNum><DisplayText><style face="superscript">28</style></DisplayText><record><rec-number>2455</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1390995933">2455</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Kumar, Sangeeta Amit</author><author>Urbani, Maxence</author><author>Medel, María</author><author>Ince, Mine</author><author>González-Rodríguez, David</author><author>Chandiran, Aravind Kumar</author><author>Bhaskarwar, Ashok N.</author><author>Torres, Tomás</author><author>Nazeeruddin, Md K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>Adapting Ruthenium Sensitizers to Cobalt Electrolyte Systems</title><secondary-title>J. Phys. Chem. Lett.</secondary-title></titles><periodical><full-title>J. Phys. Chem. Lett.</full-title></periodical><pages>501-505</pages><volume>5</volume><number>3</number><dates><year>2014</year></dates><publisher>American Chemical Society</publisher><isbn>1948-7185</isbn><urls><related-urls><url> It is notable that the TT-230 dye was even functionalized with the cyclopenta(2,1-b:3,4-b’)dithiophene moieties,PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GZW5nPC9BdXRob3I+PFllYXI+MjAxMzwvWWVhcj48UmVj
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ADDIN EN.CITE.DATA 29 which were widely used in organic push-pull dyes for extending the optical response, retarding charge recombination and suppressing dark current, but is still unable to boost its performances. On the other hand, DSCs with Co2+/3+ electrolytes are known to display higher solar cell efficiency, if the employed organic sensitizers were decorated with adequate bulky and electron donating appendages ADDIN EN.CITE <EndNote><Cite><Author>Xu</Author><Year>2012</Year><RecNum>1612</RecNum><DisplayText><style face="superscript">30</style></DisplayText><record><rec-number>1612</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1331367665">1612</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" charset="161" size="100%">Xu, Mingfei</style></author><author><style face="normal" font="default" charset="161" size="100%">Zhang, Min</style></author><author><style face="normal" font="default" charset="161" size="100%">Pastore, Mariachiara</style></author><author><style face="normal" font="default" charset="161" size="100%">Li, Renzhi</style></author><author><style face="normal" font="default" charset="161" size="100%">De Angelis, Filippo</style></author><author><style face="normal" font="default" charset="161" size="100%">Wang, Peng</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Joint electrical, photophysical and computational studies on D-</style><style face="normal" font="default" charset="161" size="100%">π-A dye sensitized solar cells: the impacts of dithiophene rigidification</style></title><secondary-title>Chem. Sci.</secondary-title></titles><periodical><full-title>Chem. Sci.</full-title></periodical><pages>976</pages><volume>3</volume><number>4</number><dates><year>2012</year></dates><urls></urls></record></Cite></EndNote>30 and with rigidified skeletal structure, ADDIN EN.CITE <EndNote><Cite><Author>Cai</Author><Year>2013</Year><RecNum>3097</RecNum><DisplayText><style face="superscript">31</style></DisplayText><record><rec-number>3097</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1406796864">3097</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Cai, Ning</author><author>Zhang, Jing</author><author>Xu, Mingfei</author><author>Zhang, Min</author><author>Wang, Peng</author></authors></contributors><titles><title>Improving the Photovoltage of Dithienopyrrole Dye-Sensitized Solar Cells via Attaching the Bulky Bis(octyloxy)biphenyl Moiety to the Conjugated π-Linker</title><secondary-title>Adv. Funct. Mater.</secondary-title></titles><periodical><full-title>Adv. Funct. Mater.</full-title></periodical><pages>3539-3547</pages><volume>23</volume><number>28</number><keywords><keyword>solar cells</keyword><keyword>organic dyes</keyword><keyword>charge transfer</keyword><keyword>interfacial microstructures</keyword></keywords><dates><year>2013</year></dates><publisher>WILEY-VCH Verlag</publisher><isbn>1616-3028</isbn><urls><related-urls><url> to bring forth the anticipated enhancement in both JSC and VOC, by avoiding the aggregation and facilitating the photo-induced electron transfer process.To gain further insight into the rates of interfacial recombination of electrons from the TiO2 conduction band to the redox mediators in the electrolyte, variation of the TiO2 conduction band potential was accessed by measuring the capacitance for three DSC devices at each VOC using the charge extraction (CE) method and intensity-modulated photovoltage spectroscopy (IMVS) measurement. Comparing that of TFRS-80a and 80c, a lower VOC for TFRS-80b is noticed (see Table 3). As shown in Figure 4a, the CE results indicate that the TiO2 conduction band potential of the devices with the Co-phen electrolyte showed a systematic upward shift in the order TFRS-80b < 80c < 80a, consistent with the variation of their VOC. ADDIN EN.CITE <EndNote><Cite><Author>Moehl</Author><Year>2013</Year><RecNum>281</RecNum><DisplayText><style face="superscript">32</style></DisplayText><record><rec-number>281</rec-number><foreign-keys><key app="EN" db-id="sdtxpzfr6xa225ez2v0vs5wd5xtd9520ez5a" timestamp="1385791281">281</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Moehl, Thomas</author><author>Tsao, Hoi Nok</author><author>Wu, Kuan-Lin</author><author>Hsu, Hui-Chu</author><author>Chi, Yun</author><author>Ronca, Enrico</author><author>De Angelis, Filippo</author><author>Nazeeruddin, Mohammad K.</author><author>Gr?tzel, Michael</author></authors></contributors><titles><title>High Open-Circuit Voltages: Evidence for a Sensitizer-Induced TiO2 Conduction Band Shift in Ru(II)-Dye Sensitized Solar Cells</title><secondary-title>Chem. Mater.</secondary-title></titles><periodical><full-title>Chem. Mater.</full-title></periodical><pages>4497-4502</pages><volume>25</volume><number>22</number><dates><year>2013</year><pub-dates><date>2013/11/26</date></pub-dates></dates><publisher>American Chemical Society</publisher><isbn>0897-4756</isbn><urls><related-urls><url> Figure 4b and 4c show plots of electron lifetime under five different light intensities. The results indicate a systematic trend with the electron lifetime showing an order of TFRS-80c > 80a > 80b for the Co-phen electrolyte and the order of TFRS-80a > 80c > 80b for the electrolyte I-B, respectively. These trends correspond to the degree of charge recombination, and are also consistent with the variation of VOC for these devices. Normally, the electron lifetime has the opposite trend versus charge recombination. Longer electron lifetime would correspond to smaller charge recombination loss and higher VOC in solar cells. Additionally, the electron lifetime of TFRS-80c is the highest for all the cells using Co2+/3+ based electrolyte. Thus, this proves the non-accumulation of Co3+ species in the proximity of TiO2 surface and the decrease in charge recombination due to the efficient blocking effect of TFRS sensitizers.ConclusionTo sum up, we have designed and prepared a series of thiocyanate-free Ru(II) sensitizers, i.e. TFRS-80a, 80b and 80c, all with similar electrochemical proerties and identical optical response under simulated one sun illumination, but showing varied steric impediment upon depsiting on TiO2 surface according to the coordination orientation of the tpiq ancillaries. Among the photophysical and electrochemical parameters collected, the hole-diffusion coefficients are the most important, which follow the trend of TFRS-80a > 80b > 80c (4.21, 1.28 and 0.203 x 10-10 cm2s-1). This trend supports the effective blockage of π-π interactions by 2,6-dihexyloxylphenyl substituents, since TFRS-80a, 80b and 80c have respectively zero, one and two tpiq arms in position to minimize dye-dye interactions on the TiO2 surface.DSCs with I?/I3? electrolyte were first fabricated, among which the TFRS-80a and TFRS-80b showed the highest and the lowest efficiencies of η = 8.37 and 5.55 %, for which the large variation was mainly determined by the amount of dye uptake and hence, give decreased light harvesting capability and enhanced charge recombination across the TiO2-dye-electrolyte interface for the asymmetric TFRS-80b. In sharp contrast, DSCs with [Co(phen)3]2+/3+ electrolyte showed much superior efficiencies for all TFRS-80 sensitizers and, most importantly, the detected efficiency increased to η = 9.06 % in the symmetrical TFRS-80a. Their advantages are apparently due to the combination of several factors, namely: (i) charge neutrality, (ii) absence of thiocyanate ligands, (iii) enhanced dye loading, and (iv) adequate spatial impediment upon depositing on TiO2 surface. All these contributing factors are essential for preventing the strong association to the Co2+/3+ mediator, which therefore reduces the charge recombination across the interface of TiO2 and electrolyte. The knowledge gained in this study should be of help to the future optimization of Ru(II) metal based sensitizers for DSC cells employing various Co2+/3+ based mediators.Experimental sectionGeneral Procedures. All reactions were performed under nitrogen. Solvents were distilled from appropriate drying agents prior to use. Commercially available reagents were used without further purification. All reactions were monitored by TLC with pre-coated silica gel plates (Merck, 0.20 mm with fluorescent indicator UV254). Compounds were visualized with UV irradiation at 254 or 365 nm. Flash column chromatography was carried out using silica gel obtained from Merck (230 - 400 mesh). Mass spectra were obtained on a JEOL SX-102A instrument operating in electron impact (EI) or fast atom bombardment (FAB) mode. 1H and 19F NMR spectra were recorded on a Bruker-400 instrument. Photophysical data were obtained using an Edinburgh Fluorescence spectrometer FLS928P. Details of the synthetic protocols for the tri-dentate ancillary chelates and the procedures for the DFT calculations are all given in the electronic supporting information.Synthesis of TFRS-80a, 80b and 80c. A xylene solution of 6-(5-(2,6-bis(hexyloxy)?phenyl)thiophen-2-yl)-1-(3-?(trifluoromethyl)-1H-pyrazol-5-yl)isoquinoline (113 mg, 0.209 mmol), Ru(diethyl 2,2'-bipyridine-4,4'-dicarboxylate)(p-cymene)Cl (60 mg, 0.104 mmol), and KOAc (52 mg, 0.531 mmol) was heated at reflux under N2 for 6 h. After the removal of solvent under vacuum, the residue was dissolved in CH2Cl2 and washed with water (3 x 20 mL). Concentration of this CH2Cl2 solution gave a dark-brown oily solid. It was then purified by silica gel column chromatography eluting with a 1:4 mixture of ethyl acetate and hexane to afford a mixture of isomers a and c and analytically pure isomer b. Then, analytically pure a and c were separated by a second silica gel column chromatography using a 1:20 mixture of ethyl acetate and CH2Cl2.For hydrolysis, each of the samples was dissolved in a mixed acetone (20 mL) and 1 M NaOH solution (0.1 mL), and heated to reflux under N2 for 3h. After this, the solution was diluted with water (10 mL) and, then, acidified with 2M HCl to pH 3 to afford a brown precipitate. This was collected and washed with water, acetone, and diethylether in sequence, yield: 52 mg, 32% for TFRS-80a, 18 mg, 11% for TFRS-80b, and 25 mg, 15% for TFRS-80c.Spectral data of TFRS-80a: MS (FAB, 102Ru): m/z 1588 (M+1)+. 1H NMR (400 MHz, d6-DMSO, 298K): δ 8.98 (s, 2H), 8.86 (d, J = 9.2 Hz, 2H), 8.14 (d, J = 6.0 Hz, 2H), 8.07 (s, 2H), 8.01(d, J = 8.8 Hz, 2H), 7.83 (s, 2H), 7.74 (d, J = 6.0 Hz, 2H), 7.68 (d, J = 4.0 Hz, 2H), 7.57 (d, J = 4.0 Hz, 2H), 7.53 (d, J = 6.8 Hz, 2H), 7.21 (t, J = 8.4 Hz, 2H), 7.04 (d, J = 6.4 Hz, 2H), 6.70 (d, J = 8.4 Hz, 4H), 3.99 (t, J = 6.4 Hz, 8H), 1.71 (m, 8H), 1.38 (m, 8H), 1.22 (m, 16H), 0.74 (t, J = 6.8 Hz, 12H). 19F NMR (376 MHz, d6-DMSO, 298K): δ ?60.12 (s, 6F). Anal. Calcd. for C82H82F6N8O8RuS2·H2O: C, 61.37; N, 6.98; H, 5.28. Found: C, 61.21; N, 6.71; H,5.44. Spectral data of TFRS-80b: MS (FAB, 102Ru): m/z 1587 (M)+. 1H NMR (400 MHz, d6-DMSO, 298K): δ 8.90 (m, 4H), δ 8.18 (s, 1H), δ 8.13 (s, 1H), 8.07 (d, J = 8.0 Hz 2H), 8.01 (m, 1H), 7.83 (s, 1H), 7.77 (m, 5H), 7.71 (s, 1H), 7.61 (t, J = 3.6 Hz, 2H), 7.51 (d, J = 6.4 Hz, 1H), 7.45 (d, J = 6.4 Hz, 1H), 7.39 (d, J = 6.4 Hz, 1H), 7.33 (d, J = 6.4 Hz, 1H), 7.24 (m, 2H), 6.77 (d, J = 3.6 Hz, 2H), 6.75 (d, J = 4.0 Hz, 2H), 4.05 (m, 8H), 1.74 (m, 8H), 1.27 (m, 8H), 1.23 (m, 16H), 0.79 (t, J = 6.8 Hz, 12H). 19F NMR (376 MHz, d6-DMSO, 298K): δ ?57.74 (s, 3F), ?57.79 (s, 3F). Anal. Calcd. for C82H82F6N8O8RuS2·2H2O: C, 60.69; N, 7.02; H, 5.34. Found: C, 60.56; N, 6.74; H, 5.49.Spectral data of TFRS-80c: MS (FAB, 102Ru): m/z 1587 (M)+. 1H NMR (400 MHz, d6-DMSO, 298K): δ 8.86 (d, J = 4.4 Hz, 2H), 8.76 (s, 2H), 8.06 (s, 2H), 8.02 (d, J = 9.2 Hz, 2H), 7.91 (d, J = 5.2 Hz, 2H), 7.80 (s, 2H), 7.69 (d, J = 3.6 Hz, 2H), 7.63 (d, J = 5.6 Hz, 2H), 7.58 (d, J = 3.6 Hz, 2H), 7.49 (d, J = 6.4 Hz, 2H), 7.22 (t, J = 8.4 Hz, 2H), 7.07 (d, J = 6.4 Hz, 2H), 6.72 (d, J = 8.4 Hz, 4H), 4.00 (t, J = 6.0 Hz, 8H), 1.71 (m, 8H), 1.39 (m, 8H), 1.22 (m, 16H), 0.75 (t, J = 6.8 Hz, 12H). 19F NMR (376 MHz, d6-DMSO, 298K): δ ?57.91 (s, 6F). Anal. Calcd. for C82H82F6N8O8RuS2·H2O: C, 61.37; N, 6.98; H, 5.28. Found: C, 61.33; N, 6.75; H, 5.34.Device fabrication. The cells consisted of a 3.6 μm transparent layer of 20 nm TiO2 nanoparticles, on which was superimposed a second layer, 3.5 μm of 400 nm TiO2 nanoparticles for enhancing light scattering. This double layer film was heated to 500 °C, sintered for 30 min, cooled to 80 °C, and then immersed into the dye solution (0.3 mM) containing 10 vol.% DMSO and 2 eq. of tetrabutylammonium deoxycholate [TBA][DOC] in anhydrous ethanol for 12 h. The iodine electrolyte I-A contains 0.6 M DMPII (1,2-dimethyl-3-propyl-imidazolium iodide), 0.05 M I2, 0.5 M TBP (4-tert-butylpyridine) in acetonitrile. The cobalt electrolyte Co-phen contains 0.45 M [Co(phen)3][TFSI]2, 0.15 M [Co(phen)3][TFSI]3, 0.15 M LiTFSI, and 0.8 M TBP in acetonitrile. The iodine electrolyte I-B contains 0.45 M DMPII, 0.05 M I2, 0.15 M LiI, and 0.8 M TBP in acetonitrile. The counter electrodes were coated with an ultra-thin layer of the PVP capped platinum nanoclusters (PVP-Pt) in aqueous solution via a so-called “two-step dip coating” process on FTO glass (7Ω/TEC7, 2.2 mm thick, Pilkington), followed by a post heating at 325 °C for 10 min. ADDIN EN.CITE <EndNote><Cite><Author>Wei</Author><Year>2006</Year><RecNum>1942</RecNum><DisplayText><style face="superscript">33</style></DisplayText><record><rec-number>1942</rec-number><foreign-keys><key app="EN" db-id="99zvtsp0a5rdpyef5euxprwaftpx0w0tp25f" timestamp="1360331950">1942</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Wei, T. C.</author><author>Wan, C. C.</author><author>Wang, Y. Y.</author></authors></contributors><titles><title>Poly(N-vinyl-2-pyrrolidone)-capped platinum nanoclusters on indium-tin oxide glass as counterelectrode for dye-sensitized solar cells </title><secondary-title>Appl. Phys. Lett.</secondary-title></titles><periodical><full-title>Appl. Phys. Lett.</full-title></periodical><pages>103122</pages><volume>88</volume><dates><year>2006</year></dates><urls></urls></record></Cite></EndNote>33 The dye sensitized TiO2 electrodes were assembled with Pt counter electrodes by inserting a hot-melt Surlyn film (Meltonix 1170-25, 25 ?m, Solaronix) as spacer, and then heated at 130 °C. The electrolyte was injected into the cell through a predrilled hole at the counter electrode. The hole was sealed with a Surlyn sheet and a thin glass to avoid leakage. All fabricated DSC cells consist of an active area of 5 5 mm2, and the performances were measured using a black metal mask with an aperture area of 4 4 mm2.Electrochemical characterization of dyes on TiO2: Conductive FTO glass slides were cleaned with soap, water, deionized water, acetone and ethanol, dried under hot air and TiO2 paste (Dyesol 18 NR-T) was deposited on the FTO glass via doctor blading. The films were sintered at 450°C for 30 min; the resulting film thicknesses were 6 μm. After cooling, the films were left in the dye bath (0.3mM in DMSO/EtOH (V/V, 1:9)) for 30h, then rinsed in acetonitrile for 1 min. Cyclic voltammetry (CV) measurements were performed using a three-electrode cell with the FTO/dyed-TiO2 film as the working electrode, a Pt rod counter electrode and an Ag/AgCl reference electrode. The electrolyte composition was 0.1M TBAPF6 dissolved in acetonitrile bubbled with nitrogen for 15 min before the experiment.Photovoltaic Characterization. Photovoltaic measurements were carried out under a class-AAA solar simulator (Model 11016A, Sun 3000, ABET Technologies) equipped with a 550 W xenon light source and water-cooling stage (25 °C). The output power density was calibrated to be 100 mW/cm2 using a certificated KG-5 Si reference cell and with a circular aperture of 8 mm. The current-voltage characteristic of each cell was obtained with a 4-wire sense mode, delay time set as 100 ms and bias scan from short-circuit to open-circuit by using a Keithley digital source meter (Model 2400). The spectra of the incident photon-to‐current conversion efficiency (IPCE) were calculated with the equation 1240?JSC(λ)/(λ?Pin(λ)) where JSC is the short-circuit current density under each monochromatic illumination in units of A/cm2, λ is the wavelength of incident monochromatic light in units of nanometers, and Pin is the monochromatic light intensity in units of W/cm2, plotted as a function of incident wavelength with an increment of 10 nm. The current was pre-amplified by a current amplifier (SR570) and measured by Keithley 2400 source meter. It should be noted that 10 sets of JSC (interval 50 ms) were collected sequentially after illuminating the device for 3 seconds and then averaged for calculation of IPCE. A 300 W Xe lamp (Model 6258, Newport Oriel) combined with an Oriel cornerstone 260 1/4 m monochromator (Model 74100) provided a monochromatic beam (dc mode) for the device under test conditions. The beam power intensity was calibrated with a power meter (Model 1936-C, Newport) equipped with a Newport 818‐UV photodetector.Charge extraction and intensity-modulated photovoltage spectroscopy. Charge extraction was measured with the PGSTAT302N electrochemical workstation (Autolab) at open-circuit condition for the photovoltage of the device to attain a steady state. A red light-emitting diode (LED, 627 nm) was attenuated while the device simultaneously switched to a short-circuit condition to measure the excess charges generated in the film. Intensity-modulated photovoltage spectroscopy (IMVS) measurement was conducted using the same electrochemical workstation equipped with a frequency response analyzer (FRA) to drive the red LED. Photovoltage response of the cells was analyzed in the frequency range of 1 – 104 Hz and LED supplied the AC (modulation depth 10%) perturbation current superimposed on the DC current.Acknowledgements. This research was supported by Ministry of Science and technology of Taiwan, MOST 100-2119-M-002-008, and the UK EPSRC Global Grant EP/K004468. YH thanks the China Scholarship Council and the University of Edinburgh for a studentship.Figure 1. UV/Vis absorption spectra of various TFRS-80 sensitizers (1 10?5 M) in DMF. Inset: spectra of samples adsorbed on 5 μm transparent TiO2 thin film.TFRS-80aTFRS-80bTFRS-80cLUMO-2.91 eV-3.07 eV-3.19 eVHOMO-5.44 eV-5.35 eV-5.32 eVHOMO-1-5.52 eV-5.47 eV-5.40 eVFigure 2. Molecular orbital distributions and energy of Ru(II) sensitizers (isodensity = 0.020 a.u.).Figure 3. IPCE action spectra for DSC cells fabricated using (a) electrolyte I-A and (b) electrolyte Co-phen and another I?/I3? electrolyte I-B under AM1.5 solar irradiation.Figure 4. (a) Electron density versus voltage deduced from charge extraction measurement; (b) IMVS measurement for cells using the electrolyte Co-phen and (c) IMVS measurement for cells using I?/I3? electrolyte I-B.Table 1. Photophysical and electrochemical data of the studied sensitizers recorded in DMF at RT.Dyeλabs [nm] (ε 10?3 [M-1·cm-1])E°'ox[a]E0-0[b]E°'*[c]TFRS-80a309 (54), 360 (62), 523(39)0.871.89?1.00TFRS-80b310 (51), 366 (64), 524 (37)0.831.90?1.07TFRS-80c308 (44), 362 (51), 527 (32)0.781.87?1.09[a] Oxidation potential of dye was measured in DMF with 0.1 M [TBA][PF6] and with a scan rate of 50 mV s-1. It was calibrated with Fc/Fc+ reference and converted to NHE by addition of 0.63 V. [b] E0-0 was determined from the intersection of the absorption and the tangent of emission peak in DMF. [c] E°'* = E°'ox ? E0-0.Table 2. Performance characteristics for DSCs based on I?/I3? electrolyte I-A under AM 1.5G irradiation.[a]DyeJSC [mA?cm-2]VOC [mV]FFη [%]dye loading[b]TFRS-80a12.938900.7278.371.72TFRS-80b9.817800.7255.551.03TFRS-80c12.418800.7568.261.21TFRS-80ac13.128700.7318.34[a] All devices were fabricated using methods depicted in the experimental section. [b] Dye desorption experiment was performed using 1M TBAOH in water/MeOH (v/v, 1:1). The dye loading is in unit of 10-7 mol?cm?2.Table 3. Performance characteristics for DSCs based on Co2+/3+ electrolyte Co-phen and I?/I3? electrolyte I-B, under AM 1.5G irradiation.DyeelectrolyteJSC [mA?cm-2]VOC [mV]FFη [%]TFRS-80aCo-phen13.448400.7578.55I-B14.497800.6687.55TFRS-80bCo-phen13.308200.7668.36I-B10.396800.6814.80TFRS-80cCo-phen14.328400.7549.06I-B14.847300.6517.06 ADDIN EN.REFLIST References 1.(a) L. M. Goncalves, V. de Zea Bermudez, H. A. Ribeiro and A. M. Mendes, Energy Environ. Sci., 2008, 1, 655; (b) A. Hagfeldt, G. Boschloo, L. Sun, L. Kloo and H. 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