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Method of the Selenization of Liquid Cu-In Alloy for the Synthesis of CuInSe2

A method of the selenization of a Cu-In alloy for the synthesis of CuInSe2 is presented. This method can avoid binary compounds formed in the reaction processes which have been one of the main problems of the stoichiometry control. A single phase of CuInSe2 is obtained with the selenization temperature above the melting point of CuInSe2. Below this optimum selenization temperature, Cu7Se4 and In2Se are found as additional phases, which is consistent with the formation mechanism of CuInSe2 in the normal melting method.