离子液体诱导的奥斯特瓦尔德熟化效应助力高效稳定的锡基钙钛矿太阳能电池
Ionic Liquid-Induced Ostwald Ripening Effect for Efficient and Stable Tin-Based Perovskite Solar Cells.
作者信息
Lin Zhuojia, Su Yang, Dai Runying, Liu Gengling, Yang Jia, Sheng Wangping, Zhong Yang, Tan Licheng, Chen Yiwang
机构信息
College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
出版信息
ACS Appl Mater Interfaces. 2021 Apr 7;13(13):15420-15428. doi: 10.1021/acsami.1c01408. Epub 2021 Mar 24.
Tin-based perovskite solar cells (PVSCs) are regarded as the most promising alternative among lead-free PVSCs. However, the rapid crystallization for tin-based perovskite tends to cause inferior film morphology and abundant defect states, which make poor photovoltaic performance. Here, 1-butyl-3-methylimidazolium bromide (BMIBr) ionic liquids (ILs) with strong polarity and a low melting point are first employed to produce the Ostwald ripening effect and obtain high-quality tin-based perovskite films with a large grain size. Meanwhile, the non-radiative recombination ascribed from defect states can also be effectively reduced for BMIBr-treated perovskite films. Consequently, a photoelectric conversion efficiency (PCE) of 10.09% for inverted tin-based PVSCs is attained by the Ostwald ripening effect. Moreover, the unencapsulated devices with BMIBr retain near 85% of the original PCE in a N glovebox beyond 1200 h and about 40% of the original PCE after exposure to air for 48 h.
锡基钙钛矿太阳能电池（PVSCs）被认为是无铅PVSCs中最具前景的替代方案。然而，锡基钙钛矿的快速结晶往往会导致较差的薄膜形态和大量的缺陷态，从而使光伏性能不佳。在此，首次采用具有强极性和低熔点的1-丁基-3-甲基咪唑溴盐（BMIBr）离子液体（ILs）来产生奥斯特瓦尔德熟化效应，并获得具有大晶粒尺寸的高质量锡基钙钛矿薄膜。同时，对于经BMIBr处理的钙钛矿薄膜，由缺陷态引起的非辐射复合也能得到有效降低。因此，通过奥斯特瓦尔德熟化效应，倒置锡基PVSCs的光电转换效率（PCE）达到了10.09%。此外，具有BMIBr的未封装器件在N手套箱中超过1200小时后仍保留近85%的原始PCE，在暴露于空气中48小时后仍保留约40%的原始PCE。
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