Band gap tunable and improved microstructure characteristics of Cu 2ZnSn(S1-x,Sex)4 thin films by annealing under atmosphere containing S and Se

Seung Wook Shin, In Young Kim, K. V. Gurav, Chae Hwan Jeong, Jae Ho Yun, P. S. Patil, Jeong Yong Lee, Jin Hyeok Kim

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Cu2ZnSn(SxS1-x)4 (CZTSSe) thin films were prepared by annealing a stacked precursor prepared on Mo coated glass substrates by the sputtering technique. The stacked precursor thin films were prepared from Cu, SnS2, and ZnS targets at room temperature with stacking orders of Cu/SnS2/ZnS. The stacked precursor thin films were annealed using a tubular two zone furnace system under a mixed N2 (95%) + H2S (5%) + Se vaporization atmosphere at 580 C for 2 h. The effects of different Se vaporization temperature from 250 C to 500 C on the structural, morphological, chemical, and optical properties of the CZTSSe thin films were investigated. X-ray diffraction patterns, Raman spectroscopy, and X-ray photoelectron spectroscopy results showed that the annealed thin films had a single kesterite crystal structure without a secondary phase. The 2θ angle position for the peaks from the (112) plane in the annealed thin films decreased with increasing Se vaporization temperature. Energy dispersive X-ray results showed that the presence of Se in annealed thin films increased from 0 at% to 42.7 at% with increasing Se vaporization temperatures. UV-VIS spectroscopy results showed that the absorption coefficient of all the annealed thin films was over 104 cm-1 and that the optical band gap energy decreased from 1.5 eV to 1.05 eV with increasing Se vaporization temperature.

Original languageEnglish (US)
Pages (from-to)1837-1843
Number of pages7
JournalCurrent Applied Physics
Volume13
Issue number8
DOIs
StatePublished - 2013

Keywords

  • Band gap tunable characteristics
  • CuZnSn(S,Se) (CZTSSe)
  • Earth abundant materials
  • Low cost-effective absorber materials
  • Thin film solar cells (TFSCs)

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