Wang Chen, Yi Qinghua, Zhang Qiang, Wang Fumao, Zou Guifu
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao. 266590, People's Republic of China. College of Energy, Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies. Soochow University, Suzhou, 215000, People's Republic of China.
Nanotechnology. 2020 May 8;31(19):195705. doi: 10.1088/1361-6528/ab70fe. Epub 2020 Jan 28.
CuBaSn(S Se ) has shown great prospects in the photoelectric field due to Earth-abundance, low toxicity, cost efficiency, direct bandgap, high absorption coefficient (>10 cm) and reduced anti-site disorder relative to CuZnSn(S Se ). A fully-tunable ratio of S/Se is the key to broaden the bandgap of CuBaSn(S Se ). Here, we introduce a thionothiolic acid metathesis process to readily tune the stoichiometry of CuBaSn(S Se ) films for the first time. Different stoichiometric Se/(S + Se) of CuBaSn(S Se ) from zero to one can vary the bandgap range from 2 to 1.68 eV. The grain size of CuBaSn(S Se ) films can be grown more than 10 μm. The optimized bandgap and high-quality growth of CuBaSn(S Se ) films ensure the best power conversion efficiency of 2.01% for solution-processed CuBaSn(S Se ) solar cells. This method provides an alternative solution-processed way for the synthesis of fully stoichiometric CuBaSn(S Se ).
由于储量丰富、毒性低、成本效益高、直接带隙、高吸收系数（>10⁵ cm⁻¹）以及相对于CuZnSn(S,Se)₄减少的反位无序，CuBaSn(S,Se)₄在光电领域展现出了巨大的前景。硫/硒的完全可调比例是拓宽CuBaSn(S,Se)₄带隙的关键。在此，我们首次引入硫代硫醇酸复分解过程来轻松调节CuBaSn(S,Se)₄薄膜的化学计量比。CuBaSn(S,Se)₄不同化学计量比的硒/(硫 + 硒)从零到一可使带隙范围从2 eV变化到1.68 eV。CuBaSn(S,Se)₄薄膜的晶粒尺寸可以生长到超过10 μm。CuBaSn(S,Se)₄薄膜优化的带隙和高质量生长确保了溶液法制备的CuBaSn(S,Se)₄太阳能电池的最佳功率转换效率为2.01%。该方法为合成完全化学计量的CuBaSn(S,Se)₄提供了一种溶液法替代方案。
