期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 23, 页码 6857-6861出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201500274
关键词
charge transfer; dye-sensitized solar cells; energy conversion; ruthenium; time-resolved spectroscopy
资金
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-FG02-07ER46427]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
Efficient sensitized photocathodes are highly desired for solar fuels and tandem solar cells, yet the development is hindered by the scarcity of suitable p-type semiconductors. The generation of high cathodic photocurrents by sensitizing a degenerate n-type semiconductor (tin-doped indium oxide; ITO) is reported. The sensitized mesoporous ITO electrodes deliver cathodic photocurrents of up to 5.96 +/- 0.19mAcm(-2), which are close to the highest record in conventional p-type sensitized photocathodes. This is realized by the rational selection of dyes with appropriate energy alignments with ITO. The energy level alignment between the highest occupied molecular orbital of the sensitizer and the conduction band of ITO is crucial for efficient hole injection. Transient absorption spectroscopy studies demonstrate that the cathodic photocurrent results from reduction of the photoexcited sensitizer by free electrons in ITO. Our results reveal a new perspective toward the selection of electrode materials for sensitized photocathodes.
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