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Optical and surface probe investigation of secondary phases in Cu2ZnSnS4 films grown by electrochemical deposition

Title
Optical and surface probe investigation of secondary phases in Cu2ZnSnS4 films grown by electrochemical deposition
Authors
Kim, Gee YeongJo, WilliamLee, Kee DooChoi, Hee-SuKim, Jin YoungShin, Hae-YoungTrang Thi Thu NguyenYoon, SeokhyunJoo, Beom SooGu, MinseonHan, Moonsup
Ewha Authors
조윌렴윤석현
SCOPUS Author ID
조윌렴scopus; 윤석현scopus
Issue Date
2015
Journal Title
SOLAR ENERGY MATERIALS AND SOLAR CELLS
ISSN
0927-0248JCR Link1879-3398JCR Link
Citation
vol. 139, pp. 10 - 18
Keywords
Cu2ZnSnS4Electrochemical depositionWork functionSecondary phasesKelvin probe force microscopyRaman scattering spectroscopy
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Cu2ZnSnS4 (CZTS) films were grown by electrochemical deposition, and we measured the work function of the as-grown and of the KCN-etched CZTS surfaces by using Kelvin probe force microscopy (KPFM) and micro-Raman scattering spectroscopy with incident laser wavelengths of 488.0 and 632.8 nm, respectively, and the results indicate that a secondary phase formed at different depths. The KPFM measurements can discriminate phase uniformity at the nano-scale. Secondary phases, such as Cu2-xS (0<x< 1), ZnS, and MoS2, were identified on the as-grown surface while Cu2-xS was removed from the KCN-etched surface. The KCN-etched CZTS absorption layer was measured to have a 5.0% conversion efficiency. Owing to the low cost of electrochemical deposition, it is desirable to obtain high tailored CZTS films can be obtained with the robust surface characteristics of a uniform work function with a single phase. (C) 2015 Elsevier B.V. All rights reserved.
DOI
10.1016/j.solmat.2015.03.003
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자연과학대학 > 물리학전공 > Journal papers
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