Detrimental Impact of Na Upon Rb Postdeposition Treatments of Cu(In,Ga)Se2 Absorber Layers

Abstract

Postdeposition Treatment In article number 2100390, Jessica de Wild and co-workers performed a RbF postdeposition treatment on AlOx back-passivated Cu(In,Ga)Se2 solar cells. It is found that Na present at the AlOx/Mo back contact inhibits Rb diffusion into the absorber layer. A detrimental redistribution of the alkali follows, leading to an injection barrier at the front and reduction of the acceptor concentration in the bulk.