溴掺杂对非铅铋基钙钛矿太阳能电池性能的增强作用
Bromine Doing for Performance Enhancement of Lead-Free Bismuth-Based Perovskite Solar Cells
DOI: 10.12677/MS.2020.109084, PDF,    国家自然科学基金支持
作者: 孙振兴, 王星辰, 汪 慧, K. P. Homewood, 高 云*, 雷丙龙*：湖北大学材料与工程学院，湖北 武汉
关键词: 铋基；钙钛矿；溴；掺杂；薄膜；太阳能电池；Bismuth； Perovskite； Bromine； Doping； Thin Film； Solar Cell
摘要: 铋基钙钛矿材料以其无毒和稳定等优势备受广大科研工作者的关注。但Bi基钙钛矿c-轴优先生长特性很难获得平整致密的薄膜，不利于高效太阳能电池的制备。采用其他卤素原子部分替代I原子，抑制晶粒的定向生长，成为一个获得高质量薄膜的有效途径。本实验在前期研究的基础上，采用Br掺杂的方式，制备了晶粒尺寸更大、表面更致密的薄膜。测试结果表明，当掺杂少量Br元素时，钙钛矿光活性层的表面更加均匀，大幅度提高了钙钛矿层的致密性。适量的Br掺杂还可以减少薄膜内部缺陷，有效地抑制器件的非辐射复合，增强光吸收性，增加了载流子寿命，同时，掺杂的器件的光电效率得到大幅提升。本工作为铋基钙钛矿太阳能电池的进一步研究提供了参考。
Abstract: Bismuth-based perovskite materials have attracted much attention due to their non-toxic and sta-ble properties. However, it is difficult to obtain smooth and dense thin films for the preferential growth of bismuth-based perovskite along the c-axis, which is not conducive to preparation of solar cells. Therefore, using halogen atoms to partially replace I atoms and inhibiting anisotropic growth becomes an effective way to obtain high quality perovskite films. In our study, Br doping was used to prepare films consisting with larger and denser grains than those without doping. When a small amount of Br element is doped, the surface of perovskite layer is more uniform, which greatly improves the perovskite compactness. In addition, proper Br doping can reduce the internal defects of the films, effectively inhibit the non-radiation recombination, enhance the light absorption and increase the carrier life. Compared with reference devices, the photoelectric efficiency has been greatly improved.
文章引用：孙振兴, 王星辰, 汪慧, K. P.Homewood, 高云, 雷丙龙. 溴掺杂对非铅铋基钙钛矿太阳能电池性能的增强作用[J]. 材料科学, 2020, 10(9): 697-704. https://doi.org/10.12677/MS.2020.109084

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