Composition dependence of structure and optical properties of Cu<sub>2</sub>ZnSn(S,Se)<sub>4</sub> solid solutions: An experimental study

  • He J
  • Sun L
  • Chen S
 et al. 
  • 46

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Abstract

The evolution of structure and optical properties of Cu2ZnSn (SxSe1−x)4 (CZTSSe) solid solutions in a wide composition range (0 ≤ x ≤ 1) has not been fully elucidated. We have performed comprehensive characterization on the CZTSSe powders with different S/Se ratios, which were synthesized by the solid state reaction method. X-ray diffraction patterns demonstrate that the lattice parameters a and c of CZTSSe decrease lineally when S replace Se gradually, which obeys the Vegard's rule. The A1 Raman modes of CZTSSe show a typical two-mode behavior. The absorption spectra reveal that the band gap of CZTSSe can be tuned monotonously between 0.96 and 1.5 eV with almost linearity, and a small band gap bowing constant (b ≈ 0.08 eV) is deduced.

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Authors

  • Jun He

  • Lin Sun

  • Shiyou Chen

  • Ye Chen

  • Pingxiong Yang

  • Junhao Chu

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