期刊
SUSTAINABLE ENERGY & FUELS
卷 5, 期 8, 页码 2347-2353出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1se00188d
关键词
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资金
- National Natural Science Foundation of China [21975260]
- NSFC-CNR exchange program of NSFC [22011530391]
The study demonstrated that the use of 4-nitrophthalonitrile passivator enhanced the performance of perovskite solar cells and improved their environmental stability.
Perovskite solar cells (PSCs) have achieved tremendous success in advancing high power conversion efficiencies. However, defect-induced recombination at grain boundaries (GBs) and the surface of polycrystalline perovskites seriously hinder the further performance enhancement and environmental stability of PSCs. Here, a simple passivating molecule, 4-nitrophthalonitrile (4NPN) with sigma-pi accepting nitro (-NO2) and cyano groups (-CN), was employed to passivate the charged defects in perovskites. The addition of electron-deficient 4NPN into the perovskite layer of PSCs could not only enhance V-OC and the FF, leading to high PCE over 22% but also improved environmental stability. These improvements were attributed to the effective passivation of the defects in the perovskite film by the strongly polarized nitro/cyano groups. In addition, the electron-deficient 4NPN could slightly adjust the energy level of the perovskite facilitating more efficient hole transfer. This work demonstrates the role of strong electron-withdrawing nitro/cyano groups in passivating the vacancy-defects of perovskites and 4NPN as a simple passivator conducive to obtaining high-performance PSCs.
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