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Title: Employing overlayers to improve the performance of Cu2BaSnS4 thin film based photoelectrochemical water reduction devices

Journal Article · · Chemistry of Materials

Earth-abundant copper-barium-thiostannate Cu2BaSnS4 (CBTS)-based thin films have recently been reported to exhibit the optoelectronic and defect properties suitable as absorbers for photoelectrochemical (PEC) water splitting and the top cell of tandem photovoltaic solar cells. However, the photocurrents of CBTS-based PEC devices are still much lower than the theoretical value, partially due to ineffective charge collection at CBTS/water interface and instability of CBTS in electrolytes. Here, we report on overcoming these issues by employing overlayer engineering. We find that CdS/ZnO/TiO2 overlayers can significant-ly improve the PEC performance, achieving saturated cathodic photocurrents up to 7.8 mA cm-2 at the potential of -0.10 V versus reversible hydrogen electrode (RHE) in a neutral electrolyte solution, which is much higher than the best bare CBTS film attaining a photocurrent of 4.8 mA cm-2 at the potential of -0.2 V versus RHE. Finally, our results suggest a viable approach for improving the performance of CBTS-based PEC cells.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS); National Science Foundation (NSF)
Grant/Contract Number:
AC36-08GO28308; AC02-05CH11231; CHE-1230246; DMR-1534686
OSTI ID:
1346536
Report Number(s):
NREL/JA-5900-67785
Journal Information:
Chemistry of Materials, Vol. 29, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

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Cited By (9)

Modelling of novel-structured copper barium tin sulphide thin film solar cells journal July 2019
Three‐Dimensional GeSe Microstructured Air Brick Photocathode for Advanced Solar Water Splitting journal February 2020
Efficiency enhancement of Cu2BaSnS4 experimental thin-film solar cell by device modeling journal August 2019
Cation Substitution in Earth-Abundant Kesterite Photovoltaic Materials journal January 2018
Recent Advances in Earth‐Abundant Photocathodes for Photoelectrochemical Water Splitting journal August 2018
Resistance-based analysis of limiting interfaces in multilayer water splitting photocathodes by impedance spectroscopy journal January 2019
Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting text January 2019
Three‐Dimensional GeSe Microstructured Air Brick Photocathode for Advanced Solar Water Splitting journal May 2020
Resistance-based analysis of limiting interfaces in multilayer water splitting photocathodes by impedance spectroscopy text January 2019