期刊
PROGRESS IN PHOTOVOLTAICS
卷 21, 期 1, 页码 72-76出版社
WILEY-BLACKWELL
DOI: 10.1002/pip.1174
关键词
Cu2ZnSnS4; earth-abundant absorber; co-evaporation; photoluminescence
Using vacuum process, we fabricated Cu2ZnSnS4 solar cells with 8.4% efficiency, a number independently certified by an external, accredited laboratory. This is the highest efficiency reported for pure sulfide Cu2ZnSnS4 prepared by any method. Consistent with literature, the optimal composition is Cu-poor and Zn-rich despite the precipitation of secondary phases (e.g., ZnS). Despite a very thin absorber thickness (similar to 600 nm), a reasonably good short-circuit current was obtained. Time-resolved photoluminescence measurements suggest a minority carrier-diffusion length on the order of several hundreds of nanometers and relatively good collection of photo-carriers across the entire absorber thickness. Copyright (C) 2011 John Wiley & Sons, Ltd.
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