Structural and Electrical Investigations of the Anion Exchange in Polycrystalline CuIn(S, Se)2 Thin Films

Abstract

The transition from the selenide to the sulfide in coevaporated CuIn(S, Se)₂ thin films is investigated regarding morphology, structural properties, incorporation of sulphur versus selenium, the existence of secondary phases and electrical properties. The segregation behaviour of secondary phases in In-rich and Cu-rich films and the influence on the film growth are discussed. Measurement techniques involve SEM, XRD and acceleration voltage dependent WDS.