Tris‐Heteroleptic Ruthenium–Dipyrrinate Chromophores in a Dye‐Sensitized Solar Cell |
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| Authors: | Guocan Li Ke Hu Kiyoshi C. D. Robson Prof. Serge I. Gorelsky Prof. Gerald J. Meyer Prof. Curtis P. Berlinguette Prof. Michael Shatruk |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32310 (USA);2. Department of Chemistry and Materials Science and Engineering, Johns Hopkins University, 3400?North Charles Street, Baltimore, MD, 21218 (USA);3. Department of Chemistry and the Centre for Advanced Solar Materials, University of Calgary, Calgary AB, T2N 1N4 (Canada);4. Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5 (Canada);5. Present Address: Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 (USA);6. Present Address: Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1 (Canada) |
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| Abstract: | Two novel tris‐heteroleptic Ru–dipyrrinates were prepared and tested as sensitizers in the dye‐sensitized solar cell (DSSC). Under AM 1.5 sunlight, DSSCs employing these dyes achieved power conversion efficiencies (PCEs) of 3.4 and 2.2 %, substantially exceeding the value achieved previously with a bis‐heteroleptic dye (0.75 %). As shown by electrochemical measurements and DFT calculations, the improved PCEs stem from the synthetically tuned electronic structure, which affords more negative excited state redox potentials and favorable electron injection into the TiO2 conduction band. Electron injection was quantified by nanosecond transient absorption spectroscopy, which revealed that the highest injection yield is achieved with the dye that acts as the strongest photoreductant. |
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| Keywords: | dyes/pigments dye‐sensitized solar cells injection yield N ligands ruthenium |
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