期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 17, 页码 2951-2956出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz501564q
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资金
- KAKENHI [25247052, 23245028, 25390017]
- Sumitomo Electric Industries Group CSR Foundation
- JST-CREST
Charge separation in semiconducting materials is an essential process that determines the efficiency of photovoltaic devices and photocatalysts. Herein, we report the charge-separation dynamics in type-II CdS/CdTe heterostructured nanorods revealed by femtosecond transient-absorption (TA) measurements with a broad-band white-light probe. Under selective excitation of the CdTe segment, bleaching signals at the band gap energy of CdS were dearly observed with a rise component on a subpicosecond time scale, which indicates efficient electron transfer from CdTe to CdS. The pump-energy dependence of the TA dynamics shows that hot electrons rapidly relax to the bottom of the conduction band of CdTe, and then the electrons transfer to the CdS segment.
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