Earth-abundant trigonal BaCu2Sn(SexS1-x)4(x=0-0.55) thin films with tunable band gaps for solar water splitting

被引:32
作者
Ge, Jie [1 ]
Yu, Yue
Yan, Yanfa [1 ]
机构
[1] Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA
基金
美国国家科学基金会;
关键词
CHALCOGENIDE PEROVSKITES; PHOTOCATHODE MATERIAL; HYDROGEN-PRODUCTION; VISIBLE-LIGHT; PERFORMANCE; CELLS; EFFICIENT; REDUCTION; SRCU2MS4; CUBI2O4;
D O I
10.1039/c6ta06702f
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
Photoelectrochemical (PEC) solar devices can convert abundant solar energy directly into storable, clean hydrogen fuel. Here, earth-abundant thin-film solid solutions, BaCu2Sn(SexS1-x)(4) (x = 0-0.55), demonstrated promise as low-cost absorber materials in efficient PEC solar devices. These p-type compounds crystallize in a trigonal structure and exhibit tunable band gaps of 1.67-2.05 eV for the composition x = Se/(Se + S). The photocathode based on the pure sulfide (x = 0) shows a photocurrent of similar to 5 mA cm(-2) saturated at -0.35 V vs. reversible hydrogen electrode (RHE) from a neutral electrolyte. Adding selenium decreases alloy band gaps and extends the absorption range of the solar spectrum, which increases the saturated photocurrent to similar to 11 mA cm(-2) at -0.55 V vs. RHE.
引用
收藏
页码:18885 / 18891
页数:7
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