Time resolved photoelectrochemistry with size-quantized PbS adsorbed on gold

被引:17
作者
Bakkers, EPAM [1 ]
Kelly, JJ [1 ]
Vanmaekelbergh, D [1 ]
机构
[1] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands
关键词
photoelectrochemistry; quantum dot; PbS; exciton; excited state; IMPS;
D O I
10.1016/S0022-0728(00)00016-4
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The electronic structure and decay dynamics of a long-lived photoexcited state in PbS quantum dots (QD), adsorbed as a monolayer on a gold electrode, were studied by a time resolved photoelectrochemical technique, intensity-modulated photocurrent spectroscopy (IMPS). By scanning the Fermi level of the gold, we found that the excited state consists of an electron in a deep trap and a hole in the HOMO. The rate constants of photoinduced electron tunneling between the dots and the electrode and between the dots and the electrolyte were determined. It was found that the trapped charge carrier has a lower tunneling probability than the free charge carrier, indicating that distance is the determining parameter for electron tunneling. (C) 2000 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:48 / 55
页数:8
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