期刊
NANO LETTERS
卷 21, 期 13, 页码 5788-5797出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01505
关键词
Dion-Jacobson perovskite; solar cells; carrier lifetime; trap density
类别
资金
- National Natural Science Foundation of China [21875122, 11974257]
- MOST of China [2019YFA0705900, 2020YFB1506400]
- Jiangsu Distinguished Young Talent Funding [BK20200003]
A multifluorinated aromatic spacer, 4F-PhDMA, has been developed for 2D DJ perovskites, showing high dissociation energy and improved stability. The optimized 2D DJ device with this spacer achieves a champion efficiency of 16.62%, higher than control devices, highlighting the importance of noncovalent interactions in achieving high efficiencies and stabilities in 2D DJ perovskite solar cells.
Two-dimensional Dion-Jacobson (DJ) perovskites have shown improved structure stability in comparison with Ruddlesden-Popper (RP) perovskites. However, the mechanism behind the improved stability is still largely unexplored. Here a multifluorinated aromatic spacer, namely, 4F-PhDMA, has been successfully developed for 2D DJ perovskites. It is found that the 2D DJ perovskite with a 4F-PhDMA spacer exhibits a high dissociation energy due to the multiple noncovalent interactions. The optimized 2D DJ device based on the 4F-PhDMA spacer (n = 4) exhibits a champion efficiency of 16.62% with much improved light and thermal stability. This efficiency is much higher than that of the control device using an unfluorinated spacer (n = 4, PCE = 10.11%) and is among the highest efficiencies in aromatic-spacer-based 2D DJ perovskite solar cells (PSCs). Our work highlights the importance of incorporating multiple noncovalent interactions in the 2D DJ perovskite by employing a multifluorinated aromatic spacer to achieve DJ PSCs with both high efficiency and high stability.
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