Preparation of CuIn(S,Se)2 thin films by thermal crystallization in sulfur and selenium atmosphere Original Research Article

Thin films of CuIn(S,Se)2 were prepared by thermal crystallization process for photovoltaic device applications and their properties were investigated. From EPMA analysis, S/(S+Se) atomic ratio in the thin films was changed from 0.18 to 1.0 with increasing the S/(S+Se) vapor ratio in the quartz ampoule. X-ray diffraction studies revealed that the thin films had a chalcopyrite CuIn(S,Se)2 structure and the preferred orientation to the 112 plane. The SEM images showed that the grain sizes in CuIn(S,Se)2 thin films decreased with the increase in the S/(S+Se) atomic ratio.