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In this contribution, we report on the impact of ammonium sulfide ((NH4)2Sx) chemical treatments done at room temperature on the surface properties of Cu2ZnSnSe4 (CZTSe) thin film. The first approach is based on the immersion of the absorber layer in a (NH4)2Sx solution (20wt.%). This method results in the preferential etching of Se, Sn and Zn atoms from the absorber surface. After a treatment time...
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