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Compositional and Interfacial Modification of Cu2ZnSn(S,Se)(4) Thin-Film Solar Cells Prepared by Electrochemical Deposition

Authors
Seo, Se WonJeon, Jong-OkSeo, Jung WooYu, Yi YinJeong, Jeung-hyunLee, Doh-KwonKim, HonggonKo, Min JaeSon, Hae JungJang, Ho WonKim, Jin Young
Issue Date
8-3월-2016
Publisher
WILEY-V C H VERLAG GMBH
Keywords
bandgap; electrodeposition; recombination; solar cells; thin films
Citation
CHEMSUSCHEM, v.9, no.5, pp.439 - 444
Indexed
SCIE
SCOPUS
Journal Title
CHEMSUSCHEM
Volume
9
Number
5
Start Page
439
End Page
444
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/89228
DOI
10.1002/cssc.201501256
ISSN
1864-5631
Abstract
A highly efficient Cu2ZnSn(S,Se)(4) (CZTSSe)-based thin-film solar cell (9.9%) was prepared using an electrochemical deposition method followed by thermal annealing. The Cu-Zn-Sn alloy films was grown on a Mo-coated glass substrate using a one-pot electrochemical deposition process, and the metallic precursor films was annealed under a mixed atmosphere of S and Se to form CZTSSe thin films with bandgap energies ranging from 1.0 to 1.2eV. The compositional modification of the S/(S+Se) ratio shows a trade-off effect between the photocurrent and photovoltage, resulting in an optimum bandgap of roughly 1.14eV. In addition, the increased S content near the p-n junction reduces the dark current and interface recombination, resulting in a further enhancement of the open-circuit voltage. As a result of the compositional and interfacial modification, the best CZTSSe-based thin-film solar cell exhibits a conversion efficiency of 9.9%, which is among the highest efficiencies reported so far for electrochemically deposited CZTSSe-based thin-film solar cells.
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