Novel Solution Processing of High-Efficiency Earth-Abundant Cu2ZnSn(S,Se)4 Solar Cells



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A novel solution-based approach is presented to process earth-abundant Cu2ZnSn(S,Se)4 absorbers using fully dissolved CZTS precursors in which each of the elemental constituents intermix on a molecular scale. This method enables the low-temperature processing of chemically clean kesterite films with excellent homogeneity. The high performance of resulting optoelectronic devices represents a chance to extend the impact of CZTS into the next chapter of thin-film solar cells.