Abstract
Solar cells with Cu(In,Ga)Se2 absorber layers prepared by three-stage co-evaporation with varying selenium-to-metal flux ratio were studied in terms of their metastable properties. In particular, transient behaviour of the open-circuit voltage Voc after relaxation to the stable state was investigated. A linear dependence of Voc on a logarithmic time scale was observed, the slope of which is taken as a measure for the degree of metastability. Surprisingly, upon variation of selenium flux, the slope parameter systematically varies between negative and positive values, and there are process parameters, for which the Voc transient disappears. We discuss these findings within the framework of the well-known Lany–Zunger model.
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