奥斯特瓦尔德成熟
材料科学
锡
钙钛矿(结构)
化学工程
离子键合
离子液体
纳米技术
钙钛矿太阳能电池
无机化学
离子
冶金
有机化学
催化作用
化学
工程类
图层(电子)
作者
Zhuo-Jia Lin,Yang Su,Runying Dai,Gengling Liu,Jia Yang,Wangping Sheng,Yang Zhong,Licheng Tan,Yiwang Chen
标识
DOI:10.1021/acsami.1c01408
摘要
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 N2 glovebox beyond 1200 h and about 40% of the original PCE after exposure to air for 48 h.
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