Spin-Coated CZTS Film with a Gradient Cu-Deficient Interfacial Layer for Solar Hydrogen Evolution

被引:11
作者
Xiao, Guohong [1 ]
Ren, Xiaoliang [1 ]
Hu, Yucheng [1 ]
Cao, Yuxi [1 ]
Li, Zhouyi [1 ]
Shi, Zhentao [1 ]
Jiang, Feng [1 ,2 ,3 ]
机构
[1] South China Normal Univ, Inst Hydrogen Energy Carbon Peaking & Carbon Neutr, Sch Semicond Sci & Technol, Foshan 528225, Peoples R China
[2] South China Normal Univ, Inst Semicond Sci & Technol, Guangzhou 510631, Peoples R China
[3] Chengfeng Light Energy Sci & Technol Guangzhou Ltd, Guangzhou 510799, Peoples R China
基金
中国国家自然科学基金;
关键词
MOTT-SCHOTTKY ANALYSIS; THIN-FILM; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; CU2ZNSNS4; EFFICIENT; PHOTOCATHODE; CELL; DEFECTS; HETEROJUNCTION;
D O I
10.1021/acsenergylett.4c00013
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
Kesterite Cu2ZnSnS4-based photocathodes offer promising applications for solar hydrogen evolution due to their nontoxic, cost-effective, and outstanding photoelectrochemical properties. However, the unfavorable band alignment at the CdS/CZTS interface (CBO approximate to 0.5 eV) poses challenges, including high carrier recombination and low minority carrier lifetime, limiting performance enhancement. This study demonstrates that introducing a gradient Cu-deficient interface layer (GCD-layer) significantly reduces the CBO value at the CdS/CZTS interface (to 0.27 eV), improving band alignment and enhancing carrier separation and transport efficiency of the CZTS photocathode. Moreover, the GCD-layer enhances the crystalline quality of the CZTS film and substantially reduces the charge-transfer resistance of the photocathode. Based on these findings, the prepared CZTS-based photocathode achieved an impressive photocurrent density of 24.5 mA<middle dot>cm(-2) (at 0 V-RHE), an onset voltage of 0.75 V-RHE, and an ABPE of 4.19% in neutral solution (pH 6.5). Furthermore, the CZTS-BiVO4 tandem device presented a record unbiased STH of 3.37%.
引用
收藏
页码:715 / 726
页数:12
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