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Material crystallinity is the overriding factor in the determination of the photoelectric properties of absorber materials and the overall performance of photovoltaic device.Nevertheless,in Cu2ZnSn(S,Se)4(CZTSSe)photovoltaic device the bilayer or tri-layer structure for the absorber have been broadly observed,which are generally harmful to the cell performance due to the probability of photogenerated carrier recombination at grain boundaries significantly increased.