期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 28, 页码 9854-9857出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja504473e
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资金
- European Science Foundation [291482]
- Swiss National Science Foundation [140709]
- Swiss Federal Office for Energy (PEC House Competence Center) [SI/500090-02]
Transient absorption spectroscopy on subpicosecond to second time scales is used to investigate photogenerated charge carrier recombination in Si-doped nanostructured hematite (alpha-Fe2O3) photoanodes as a function of applied bias. For unbiased hematite, this recombination exhibits a 50% decay time of similar to 6 ps, similar to 10(3) times faster than that of TiO2 under comparable conditions. Anodic bias significantly retards hematite recombination dynamics, and causes the appearance of electron trapping on ps-mu s time scales. These ultrafast recombination dynamics, their retardation by applied bias, and the associated electron trapping are discussed in terms of their implications for efficient water oxidation.
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