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Platinum-decorated Cu(InGa)Se-2/CdS photocathodes: Optimization of Pt electrodeposition time and pH level

Authors
Kim, Min-wooYoon, HyunOhm, Tae YoonMali, Mukund G.Choi, Sung KyuPark, HyunwoongAl-Deyab, Salem S.Lim, Dong ChanAhn, SeJinYoon, Sam S.
Issue Date
25-1월-2017
Publisher
ELSEVIER SCIENCE SA
Keywords
CIGS/CdS; Photocurrent; Platinum; p-n junction; Water splitting
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.692, pp.294 - 300
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
692
Start Page
294
End Page
300
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/84878
DOI
10.1016/j.jallcom.2016.08.313
ISSN
0925-8388
Abstract
Photoelectrochemical (PEC) water splitting was performed using co-evaporated Cu(In, Ga) Se-2 (CIGS, p-type) films as the photocathode. Pt was electrodeposited on CIGS and CIGS/CdS films. The effect of the electrodeposition time was investigated to determine the optimal deposition conditions. The CIGS film was covered with a 60-nm-thick CdS layer (n-type) using a chemical-bath deposition technique, which created a p-n junction. The effect of the Pt electroplating time was again investigated for the CIGS/CdS films; thus, the effect of CdS addition could be quantitatively investigated. The effect of the pH of 0.5 M Na2SO4 electrolyte was also investigated. The optimal water-splitting performance occurred at -24.16 mA/cm(2) at -0.7 V vs. Ag/AgCl with a Pt electrodeposition time of 20 min and pH 9. The CIGS/ CdS films were characterized by X-ray diffraction, scanning electron microscopy, and focused-ion beam transmission electron microscopy. (C) 2016 Elsevier B.V. All rights reserved.
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공과대학 (기계공학부)
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