Improved FF of CIGS thin-film mini-modules with Zn(O,S,OH)/sub x/ buffer by post-depostion light soaking

Abstract

In order to explain the observations on the post-deposition light soaking and understand this unique and valuable effect, a model is proposed and confirmed to work well. Based on the model, released H/sub 2/O molecules through the dehydration of Zn(OH)/sub 2/ in the Zn(O,S,OH)/sub x/ buffer during the light soaking is considered as a major player to affect the form factor (FF). The most striking result in this study is the post-deposition light soaking effect can be controlled from reversible to irreversible by adjusting the light soaking conditions. Approach to reduce the Zn(OH)/sub 2/ concentration in the buffer contributes to make a better p-n heterojunction and improve the yield.