Suppressing Defects‐Induced Nonradiative Recombination for Efficient Perovskite Solar Cells through Green Antisolvent Engineering

Organic–inorganic hybrid perovskites have attracted considerable attention due to their superior optoelectronic properties. Traditional one‐step solution‐processed perovskites often suffer from defects‐induced nonradiative recombination, which significantly hinders the improvement of device performa...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2020-09, Vol.32 (38), p.e2003965-n/a
Main Authors: Xu, Wenzhan, Gao, Yu, Ming, Wenjie, He, Fang, Li, Jingzhou, Zhu, Xu‐Hui, Kang, Feiyu, Li, Jiangyu, Wei, Guodan
Format: Article
Language:English
Subjects:
Crystal defects
Defects
Energy conversion efficiency
Ethanol
Grain size
green antisolvents
Heterojunction devices
nonradiative recombination
Optoelectronics
perovskite solar cells
Perovskites
Photovoltaic cells
power conversion efficiency
Solar cells
Surface defects
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Summary:Organic–inorganic hybrid perovskites have attracted considerable attention due to their superior optoelectronic properties. Traditional one‐step solution‐processed perovskites often suffer from defects‐induced nonradiative recombination, which significantly hinders the improvement of device performance. Herein, treatment with green antisolvents for achieving high‐quality perovskite films is reported. Compared to defects‐filled ones, perovskite films by antisolvent treatment using methylamine bromide (MABr) in ethanol (MABr‐Eth) not only enhances the resultant perovskite crystallinity with large grain size, but also passivates the surface defects. In this case, the engineering of MABr‐Eth‐treated perovskites suppressing defects‐induced nonradiative recombination in perovskite solar cells (PSCs) is demonstrated. As a result, the fabricated inverted planar heterojunction device of ITO/PTAA/Cs0.15FA0.85PbI3/PC61BM/Phen‐NADPO/Ag exhibits the best power conversion efficiency of 21.53%. Furthermore, the corresponding PSCs possess a better storage and light‐soaking stability. Antisolvent engineering is employed to tune the crystal nucleation and grain growth of perovskite for achieving efficient perovskite solar cells. The engineering of perovskites treated with the green antisolvent MABr‐Eth, suppressing defects‐induced nonradiative recombination in perovskite solar cells, is developed. As expected, the device delivers over 21% power conversion efficiency and a better storage and light‐soaking stability.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202003965