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J Am Chem Soc. 2015 Nov 11;137(44):14055-8. doi: 10.1021/jacs.5b09665. Epub 2015 Oct 28.

Porphyrin cosensitization for a photovoltaic efficiency of 11.5%: a record for non-ruthenium solar cells based on iodine electrolyte.

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1
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology , Meilong Road 130, Shanghai 200237, People's Republic of China.

Abstract

Dye-sensitized solar cells (DSSCs) are promising for utilizing solar energy. To achieve high efficiencies, it is vital to synergistically improve the photocurrent (Jsc) and the photovoltage (Voc). In this respect, conjugation framework extension and cosensitization are effective for improving the absorption and the Jsc, which, however, is usually accompanied by undesirably decreased Voc. Herein, based on a rationally optimized porphyrin dye, we develop a targeted coadsorption/cosensitization approach for systematically improving the Voc from 645 to 727, 746, and 760 mV, with synergistical Jsc enhancement from 18.83 to 20.33 mA cm(-2). Thus, the efficiency has been dramatically enhanced to 11.5%, which keeps the record for nonruthenium DSSCs using the I2/I3(-) electrolyte. These results compose an alternative approach for developing highly efficient DSSCs with relatively high Voc using traditional iodine electrolyte.

PMID:
26492075
DOI:
10.1021/jacs.5b09665

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