Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 16, Pages 8018-8024Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402096r
Keywords
photoelectrochemical; CZTS; ALD; protecting overlayers; water splitting; hydrogen
Funding
- EOS holdings S.A. [536067]
- FSB at EPFL
- Swiss Federal Office for Energy (PECHouse Competence Center) [SI/500090-02]
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Cu2ZnSnS4 (CZTS) is a promising p-type semiconductor that has not yet been extensively investigated for solar fuel production via water splitting. Here, we optimize and compare two different electrodeposition routes (simultaneous and sequential) for preparing CZTS electrodes. More consistent results are observed with the simultaneous route. In addition, the effect of etching and the presence of a CdS buffer layer on the photocurrent are investigated. Finally, we demonstrate for the first time the stabilization of these electrodes using protecting overlayers deposited by atomic layer deposition (ALD). Our best performing protected electrodes (Mo/CZTS/CdS/AZO/TiO2/Pt) exhibited a photocurrent of over 1 mA cm(-2) under standard one sun illumination conditions and a significant improvement in stability over unprotected electrodes.
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