期刊
ECOMAT
卷 4, 期 1, 页码 -出版社
WILEY
DOI: 10.1002/eom2.12158
关键词
defect passivation; interface engineering; methylammonium-free perovskite; perovskite solar cells; phosphonium salts
类别
资金
- National Natural Science Foundation of China [51773045 21772030 51922032 21961160720]
By modifying the perovskite/Spiro-OMeTAD interface with two novel phosphonium salts, the defect density is reduced and carrier lifetimes are prolonged, leading to improved power conversion efficiency in solar cells.
We modified perovskite/Spiro-OMeTAD interface by using two novel phosphonium salts containing PF6- counter anion (i.e., CITPPPF6 and BrTPPPF6). The cation and anion in phosphonium salts possess not only ionic bonds but also coordination bonds with perovskites. The anion and cation vacancies at the surface and GBs of perovskite films can be filled by phosphonium cations and PF6- anions, respectively, resulting in reduced defect density and prolonged carrier lifetimes. The stronger chemical interaction and accordingly better defect passivation were certified for BrTPPPF6 than CITPPPF6. As a result, the devices modified by CITPPPF6 and BrTPPPF6 deliver a PCE of 21.73% and 22.15%, respectively, which far exceed 20.6% of the control device. The unsealed BrTPPPF6 modified device maintains 98.2% of its initial efficiency value after thermal aging of 1320 h whereas merely 84.7% for the control device. 96.4% of its original efficiency was retained for BrTPPPF6-modified device after ambient exposure of 2016 h.
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