Band-aligned C3N4−xS3x/2 stabilizes CdS/CuInGaS2 photocathodes for efficient water reduction

Danping Wang; Chongwu Wang; F. Pelayo García de Arquer; Juhua Zhong; Ling Qian; Lijun Fang; Pengfei Liu; Yuanjie Pang; Min Liu; Mengxia Liu; Gengfeng Zheng; David Sinton; Edward H. Sargent; Huagui Yang; Bo Zhang

doi:10.1039/C6TA10222K

Band-aligned C₃N_4−xS_3x/2 stabilizes CdS/CuInGaS₂ photocathodes for efficient water reduction†

Danping Wang,^a Chongwu Wang,^b F. Pelayo García de Arquer,^c Juhua Zhong,*^a Ling Qian,^b Lijun Fang,^b Pengfei Liu,^b Yuanjie Pang,^d Min Liu,^c Mengxia Liu,^c Gengfeng Zheng,^e David Sinton,^d Edward H. Sargent,^c Huagui Yang

^b and Bo Zhang

*^ac

Author affiliations

* Corresponding authors

^a Department of Physics, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, China
E-mail: bo.zhang@ecust.edu.cn, jhzhong@ecust.edu.cn

^b Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, China

^c Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada

^d Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada

^e Laboratory of Advanced Materials, Department of Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, 2005 Song-Hu Road, Shanghai, China

Abstract

Compared with bare CIGS films and CdS-modified CIGS films (CdS/CIGS), C₃N_4−xS_3x/2/CdS/CIGS electrodes exhibit a reduction of 200 mV in the onset potential. They also show a doubled photocurrent at 0 V versus the RHE, and a broadband 20% enhancement of incident photon to current efficiency (IPCE) in noble-metal-free systems. Remarkably, the C₃N_4−xS_3x/2/CdS/CIGS electrode shows ≤5% loss over 20 hours of continuous operation, whereas bare CdS/CIGS shows a rapid degradation within the first 4 hours.

Journal of Materials Chemistry A

Band-aligned C₃N_4−xS_3x/2 stabilizes CdS/CuInGaS₂ photocathodes for efficient water reduction†

Abstract

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Band-aligned C₃N_4−xS_3x/2 stabilizes CdS/CuInGaS₂ photocathodes for efficient water reduction

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Journal of Materials Chemistry A