Abstract
Cu2ZnSnS4 (CZTS) layers are deposited by a direct solution coating of metal salts dissolved in dimethyl sulfoxide (DMSO) and thiourea as sulphur source. An intentional Sn-rich precursor is used and the influence of reactive and inert atmosphere on the layer morphology is investigated during high temperature sintering. Larger grain growth is observed when annealing the precursor in inert N2 atmosphere as compared to reactive sulphur atmosphere. An initial Sn-rich precursor composition with Zn/Sn < 1 promotes the grain growth while Sn leaves the sample during crystallization ending up with a final Zn-rich (Zn/Sn > 1) layer composition.
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