Zheng Jiajia, Fu Liuchong, He Yuming, Li Kanghua, Lu Yue, Xue Jiayou, Liu Yuxuan, Dong Chong, Chen Chao, Tang Jiang
Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.
China-EU Institute for Clean and Renewable Energy (ICARE), Huazhong University of Science and Technology, Wuhan, 430074, China.
Front Optoelectron. 2022 Sep 8;15(1):36. doi: 10.1007/s12200-022-00040-5.
Selenium (Se) element is a promising light-harvesting material for solar cells because of the large absorption coefficient and prominent photoconductivity. However, the efficiency of Se solar cells has been stagnated for a long time owing to the suboptimal bandgap (> 1.8 eV) and the lack of a proper electron transport layer. In this work, we tune the bandgap of the absorber to the optimal value of Shockley-Queisser limit (1.36 eV) by alloying 30% Te with 70% Se. Simultaneously, ZnO electron transport layer is selected because of the proper band alignment, and the mild reaction at ZnO/SeTe interface guarantees a good-quality heterojunction. Finally, a superior efficiency of 1.85% is achieved on ZnO/SeTe solar cells.
硒（Se）元素因其具有较大的吸收系数和显著的光电导率，是一种很有前景的用于太阳能电池的光捕获材料。然而，由于带隙不理想（> 1.8 eV）以及缺乏合适的电子传输层，硒太阳能电池的效率长期停滞不前。在这项工作中，我们通过将30%的碲与70%的硒合金化，将吸收体的带隙调整到肖克利-奎塞尔极限的最佳值（1.36 eV）。同时，由于能带匹配合适，选择了氧化锌电子传输层，并且氧化锌/硒碲界面处的温和反应保证了高质量的异质结。最终，氧化锌/硒碲太阳能电池实现了1.85%的优异效率。
