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Cu2ZnSnSe4 thin films prepared by selenization of precursor evaporated from Cu2ZnSnSe4 and Na2Se

  • Mitsuki Nakashima (a1), Toshiyuki Yamaguchi (a1) and Masanobu Izaki (a2)

Abstract

Cu2ZnSnSe4 thin films were prepared by using the synthesized Cu2ZnSnSe4 ingot and Na2Se powder at various Na2Se/Cu2ZnSnSe4 mole ratio as evaporation materials for selenization process. From EPMA analysis, the composition was approximately constant even if the Na2Se/Cu2ZnSnSe4 mole ratio increased. X-ray diffraction studies revealed that the thin films had a kesterite Cu2ZnSnSe4 structure and the foreign phases disappeared with increasing the Na2Se/Cu2ZnSnSe4 mole ratio. The Na2Se addition enhanced to grow thin films having a close-packed structure and columnar grains. The values of Voc and Isc in Cu2ZnSnSe4 thin film solar cells increased with increasing the Na2Se/Cu2ZnSnSe4 mole ratio.

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Keywords

Cu2ZnSnSe4 thin films prepared by selenization of precursor evaporated from Cu2ZnSnSe4 and Na2Se

  • Mitsuki Nakashima (a1), Toshiyuki Yamaguchi (a1) and Masanobu Izaki (a2)

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