Quantum efficiency of Cu2O electrode in photoelectrochemical cells with and without bias

被引:10
作者
Khan, KA [1 ]
Leung, YK [1 ]
Kos, JF [1 ]
机构
[1] UNIV REGINA,DEPT PHYS & ASTRON,SASKATOON,SK S4S 0A2,CANADA
基金
加拿大自然科学与工程研究理事会;
关键词
Number:; -; Acronym:; NSERC; Sponsor: Natural Sciences and Engineering Research Council of Canada;
D O I
10.1016/S0960-1481(96)00132-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The photoresponse of a p-type Cu2O him on copper is presented. The current-voltage characteristics exhibit a large photocurrent with an onset potential at cn. -0.2 V (S.C.E.). The electrode in the Cu2O/Pt biased cell shows high quantum efficiency which is approaching 100% for wavelength lambda approximate to 300 nm. Studies show that even for potentials just slightly more negative than V-on, the quantum efficiency is relatively large. This result may be explained either by a current doubling phenomena or could be due to a contribution to additional band gaps which may er;ist at higher energies. The overall high quantum efficiencies, moreover, can be obtained without the use of any external bias if a TiO2 counter electrode is used. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:293 / 298
页数:6
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