Cu2ZnSn(S,Se)4 Thin Films Fabricated by Sequential Evaporation using Cu2ZnSnSe4 Compound and Their Photovoltaic Applications

Abstract

Cu2ZnSnSe4 compound was synthesized and then used it as an evaporation material to fabricate Cu2ZnSn(S,Se)4 thin films for solar cell applications by sequential evaporation process. From EPMA analysis, the S content in Cu2ZnSn(S,Se)4 thin films increased and the Se content decreased with increasing the amount of S in the evaporation materials. XRD study showed that the thin films had a kesterite phase in Cu2ZnSn(S,Se)4. From SEM micrographs, the grain size in the thin films decreased with increasing the amount of S. Cu2ZnSn(S,Se)4 thin film solar cells fabricated by this process demonstrated Voc=255mV and Jsc=25.5mA/cm2.