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The influence of cyclic microwave irradiation and effect of Cu concentration has been investigated for synthesis of pure phase Cu 2 ZnSnS 4 powder. It has been observed that Cu concentration plays a vital role to get pure phase Cu 2 ZnSnS 4 . The optical properties, phase purity, crystallographic structure and morphology have been investigated by spectroscopic and microscopic techniques. The results reveal that single phase kesterite Cu 2 ZnSnS 4 with no other secondary phase can be obtained bydoi:10.1063/1.4947738 fatcat:zkn25bncpfgsfm66y4ntfsophy