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Tris-Heteroleptic Ruthenium-Dipyrrinate Chromophores in a Dye-Sensitized Solar Cell

TitleTris-Heteroleptic Ruthenium-Dipyrrinate Chromophores in a Dye-Sensitized Solar Cell
Publication TypeJournal Article
Year of Publication2015
AuthorsLi, G, Hu, K, Robson, KCD, Gorelsky, SI, Meyer, GJ, Berlinguette, CP, Shatruk, M
JournalCHEMISTRY-A EUROPEAN JOURNAL
Volume21
Pagination2173-2181
Date PublishedJAN 26
ISSN0947-6539
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.

DOI10.1002/chem.201405261