Spin-coated kesterite CZTS thin films for photovoltaic applications

L. Majula*, N. R. Mlyuka, M. E. Samiji, Bryce Sydney Richards, D. Y. Kim, S. H. Kim, H. J. Lee, H. J. Choi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Copper zinc tin-sulfide (CZTS) films have been widely studied over recent years due to the inherent advantages of low cost, high absorption coefficient (≥ 10<sup>4</sup> cm<sup>−1</sup>), suitable band gap (∼1.5 eV) and nontoxicity. In this work, spin coating was used to obtain CZTS films of various compositions and degrees of crystallization on glass substrates, which were then annealed at 500 °C in a N<inf>2</inf> atmosphere by using a rapid thermal processing (RTP) furnace in order to optimize their structure. Non-stoichiometric precursors and low spinning speeds resulted in a lower sheet resistance, which is considered to be a result of lower degree of crystallization. Furthermore, the non-stoichiometric films had a high optical band gap (> 1.66 eV) whereas the band gap of the stoichiometric films (1.4 to 1.6 eV) was close to the optimal value (1.5 eV) for solar-cell applications.

Original languageEnglish
Pages (from-to)1078-1081
Number of pages4
JournalJournal of the Korean Physical Society
Volume67
Issue number6
DOIs
Publication statusPublished - Sep 2015

Keywords

  • Copper zinc tin-sulfide (CZTS)
  • Photovoltaics
  • Rapid thermal processing
  • Spin coating
  • Thin film

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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