期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 2, 页码 1292-1297出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02293
关键词
Cd-free Cu(In,Ga)(S,Se)(2) solar cell; alkali treatment; carrier lifetime; Urbach energy; carrier recombination rate
资金
- NEDO (the New Energy and Industrial Technology Development Organization) in Japan
Cd-free Cu(In,Ga)(S,Se)(2) (CIGSSe) solar cells are fabricated by all dry process, where CIGSSe absorbers with and without alkali (K and Cs) treatments are used. Urbach energy (E-U) is estimated in long-wavelength edge of external quantum efficiency. It is revealed that reduced E-U through K and Cs treatments yields decreased open-circuit voltage deficit. Carrier recombination rates across devices are reduced through K and Cs treatments, corresponding to increased carrier lifetimes and decreased E-U. Conversion efficiency of Cd-free CIGSSe solar cells with a structure of glass/Mo/CIGSSe/Zn0.8Mg0.2O/Zn0.9Mg0.1O:Al is enhanced from about 17.8% (none alkali) to 18.5% (with K) and to 20.3% (with Cs).
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