Zhang Zeyu, Sun Qingde, Lu Yue, Lu Feng, Mu Xulin, Wei Su-Huai, Sui Manling
Beijing Key Laboratory of Microstructure and Properties of Solids, Faculty of Materials and Manufacturing, Beijing University of Technology, 100124, Beijing, China.
Beijing Computational Science Research Center, 100193, Beijing, China.
Nat Commun. 2022 Jun 13;13(1):3397. doi: 10.1038/s41467-022-31016-w.
Development of lead-free inorganic perovskite material, such as CsAgBiBr, is of great importance to solve the toxicity and stability issues of traditional lead halide perovskite solar cells. However, due to a wide bandgap of CsAgBiBr film, its light absorption ability is largely limited and the photoelectronic conversion efficiency is normally lower than 4.23%. In this text, by using a hydrogenation method, the bandgap of CsAgBiBr films could be tunable from 2.18 eV to 1.64 eV. At the same time, the highest photoelectric conversion efficiency of hydrogenated CsAgBiBr perovskite solar cell has been improved up to 6.37% with good environmental stability. Further investigations confirmed that the interstitial doping of atomic hydrogen in CsAgBiBr lattice could not only adjust its valence and conduction band energy levels, but also optimize the carrier mobility and carrier lifetime. All these works provide an insightful strategy to fabricate high performance lead-free inorganic perovskite solar cells.
开发无铅无机钙钛矿材料，如CsAgBiBr，对于解决传统卤化铅钙钛矿太阳能电池的毒性和稳定性问题至关重要。然而，由于CsAgBiBr薄膜的带隙较宽，其光吸收能力受到很大限制，光电转换效率通常低于4.23%。在本文中，通过氢化方法，CsAgBiBr薄膜的带隙可以从2.18 eV调谐到1.64 eV。同时，氢化CsAgBiBr钙钛矿太阳能电池的最高光电转换效率提高到了6.37%，并具有良好的环境稳定性。进一步的研究证实，原子氢在CsAgBiBr晶格中的间隙掺杂不仅可以调整其价带和导带能级，还可以优化载流子迁移率和载流子寿命。所有这些工作为制造高性能无铅无机钙钛矿太阳能电池提供了一种有见地的策略。
