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        Metal Chloride Precursor Synthesization of Cu2ZnSnS4 Solar Cell Materials

        Min Yen Yeh,Yu-Fong Huang,Cheng-Liang Huang,Chyi-Da Yang,Dong-Sing Wuu,Po-Hsun Lei 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.2

        Cu2ZnSnS4 (CZTS) thin films with kesterite structures were prepared by directly sol-gel synthesizingspin-coated precursors on soda-lime-glass (SLG) substrates. The CZTS precursors wereprepared by using solutions of copper (II) chloride, zinc (II) chloride, tin (IV) chloride, and thiourea. The ratio of SnCl4 in the precursors was found to play a critical role in the synthesization of CZTS. CZTS phases of SnS and SnS2 were observed in the synthesized films as prepared using precursorswith a close to stoichiometric ratio of CuCl2:ZnCl2:SnCl4:CH4N2S = 4:1:1:8, where SnCl4 was 1mol/l. The amounts of the educed SnS and SnS2 phases observed in the SEM images could bereadily reduced by decreasing the volume of SnCl4 in the mixed solution. With decreasing amountof SnCl4 from 1 mol/l, the as prepared CZTS reveals a significant improvement in its crystallineproperties. In this work, CZTS with an average absorption coefficient and an optical energy gapof over 104 cm−1 and 1.5 eV, respectively, was obtained using precursors of copper (II) chloride,zinc (II) chloride, tin (IV) chloride, and thiourea mixed in a ratio of 2:1:0.25:8, and it had goodcrystallinity revealing a Cu-poor composition.

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