PASSIVATION OF PHOTOCARRIER RECOMBINATION ON CDS PHOTOANODE BY 2-COLOR EXCITATION

被引:6
作者
NAKABAYASHI, S [1 ]
KIRA, A [1 ]
机构
[1] INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN
关键词
D O I
10.1021/j100382a048
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A CdS single-crystal photoelectrode in aqueous solution containing sodium sulfite was subjected to two-color excitation. The photocurrent caused by UV excitation was markedly enhanced by simultaneous sub-bandgap excitation; no photocurrent occurred for the sub-bandgap excitation alone. The enhancement is explained in terms of passivation of a recombination center by sub-bandgap excitation. The presence of such a recombination center is supported by photocapacitance measurement. Polarized two-color excitation and electrolyte electroreflectance spectroscopy revealed that the recombination center is not localized on the uppermost surface layer but penetrates inside. © 1990 American Chemical Society.
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页码:7571 / 7575
页数:5
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