期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 13, 页码 15420-15428出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01408
关键词
perovskite solar cells; lead-free; ionic liquid; Ostwald ripening effect; stability
资金
- National Natural Science Foundation of China (NSFC) [52063019, 51973088, 51833004, U20A20128, U1801256]
- Double Thousand Plan Science and Technology Innovation High-end Talent Project of Jiangxi Province
By employing 1-butyl-3-methylimidazolium bromide (BMIBr) ionic liquids, the Ostwald ripening effect was successfully achieved to produce high-quality tin-based perovskite films with large grain size, leading to improved photovoltaic performance. The use of BMIBr also effectively reduced non-radiative recombination in the perovskite films, resulting in a photoelectric conversion efficiency (PCE) of 10.09% for inverted tin-based PVSCs. Furthermore, the unencapsulated devices treated with BMIBr showed excellent stability with nearly 85% of the original PCE retained after 1200 hours in a N-2 glovebox.
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-2 glovebox beyond 1200 h and about 40% of the original PCE after exposure to air for 48 h.
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