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Role of Defects and Defect Metastabilities for the Performance and Stability of Cu(In,Ga)Se2 Based Solar Cells

This article deals with two important aspects of the defect physics and defect chemistry in Cu(In,Ga)Se2 polycrystalline thin films. First, metastable defects in Cu(In,Ga)Se2 lead to persistent changes of the electrical properties of the bulk material upon illumination. The article discusses a light induced defect reaction as the microscopic origin of the observed electrical behavior. The second part compares recent models for the surface of polycrystalline Cu(In,Ga)Se2 and their consequences for the formation of the ZnO/CdS/Cu(In,Ga)Se2 heterojunction.