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

Se Won Seo, Jong Ok Jeon, Jung Woo Seo, Yi Yin Yu, Jeung Hyun Jeong, Doh Kwon Lee, Honggon Kim, Min Jae Ko, Hae Jung Son, Ho Won Jang, Jin Young Kim

Research output: Contribution to journalArticle

12 Scopus citations

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 1.2 eV. 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 1.14 eV. 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.

Original languageEnglish
Pages (from-to)439-444
Number of pages6
JournalChemSusChem
Volume9
Issue number5
DOIs
StatePublished - 2016 Mar 8

Keywords

  • bandgap
  • electrodeposition
  • recombination
  • solar cells
  • thin films

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    Seo, S. W., Jeon, J. O., Seo, J. W., Yu, Y. Y., Jeong, J. H., Lee, D. K., Kim, H., Ko, M. J., Son, H. J., Jang, H. W., & Kim, J. Y. (2016). Compositional and Interfacial Modification of Cu2ZnSn(S,Se)4 Thin-Film Solar Cells Prepared by Electrochemical Deposition. ChemSusChem, 9(5), 439-444. https://doi.org/10.1002/cssc.201501256