Rare-metal free thin film solar cell

Authors:
  • MNM. Nishimura
    M. Nishimura
  • TOT. Onozawa
    T. Onozawa
  • SMS. Maruyama
    S. Maruyama
  • MFM. Fujita
    M. Fujita
  • TST. Sega
    T. Sega
  • TWT. Watanabe
    T. Watanabe

Abstract
Cu/sub 2/ZnSnS/sub 4/ (CZTS) thin films have been successfully formed on a soda lime glass substrate by vapor phase sulfurization of precursors of E-B evaporation. This semiconductor does not contain any rare-metal such as indium. In this study, we estimated the optical band gap energy as 1.45 eV and the optical absorption coefficient was in the order of 10/sup 4/ cm/sup -1/. From these optical properties, this CZTS film is very suitable for thin film solar cells. Fabricated solar cells, Al/ZnO/CdS/CZTS/Mo/soda lime glass, showed an open circuit voltage up to 522 mV.

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