Synthesis and investigation of environmental protection and earth-abundant kesterite Cu2MgxZn1-xSn(S,Se)4 thin films for solar cells |
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| Authors: | Yu Zhang Dongyue Jiang Yingrui Sui Yanjie Wu Zhanwu Wang Lili Yang Fengyou Wang Shiquan Lv Bin Yao |
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| Affiliation: | 1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, PR China;2. State Key Laboratory of Superhard Materials and College of Physics, Jilin University, Changchun 130012, PR China |
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| Abstract: | We have synthesized Cu2MgxZn1–xSn(S,Se)4 (0?≤?x?≤?0.6) thin films by a facile sol-gel method, and studied the influence of Mg concentration on the crystal structure, surface morphology and photoelectric performance of Cu2MgxZn1–xSn(S,Se)4 thin films systematically. It was shown that the smaller Zn2+ in Kesterite phase Cu2ZnSn(S,Se)4 will be replaced by larger Mg2+, forming uniform pure phase Cu2MgxZn1–xSn(S,Se)4. The band gap of Cu2MgxZn1–xSn(S,Se)4 films can be adjusted from 1.12 to 0.88?eV as the x value changes from 0 to 0.6. Furthermore, the Cu2MgxZn1–xSn(S,Se)4 thin films with large grain size, smooth surface and less grain boundaries was obtained at an optimized condition of x?=?0.2. The carrier concentration of Cu2MgxZn1–xSn(S,Se)4 thin film reaches the maximum 6.47?×?1018 cm?3 at x?=?0.2, which is a potential material to be the absorption layer of high efficiency solar cells. |
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| Keywords: | Thin films Optical properties Electrical properties Sol-gel Solar cells |
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