Solar cells based on CuIn(Se, S)2

In this contribution we report on three- and four source evaporation of CuIn(Se, S)₂ thin films. The existence of secondary phases as well as texture effects are discussed for these thin films. The quaternary system CuIn(Se, S)₂ will be considered regarding incorporation of selenium versus sulphur. Results of heterojunctions completed with (Zn, Cd)S or a composite window consisting of a thin CdS buffer and a highly conductive ZnO window layer will be reported and analyzed. A main feature will be the influence of CuS on the heterojunction and the methods to overcome this problem. Devices with an active area efficiency exceeding 10% could be obtained.