Ionic defects and humidity instability are the main limitations to realize the commercialization of FA-based perovskite solar cells. To overcome these issues, here, we report a dual-functional molecular 2-Fluorothiophenol (FTP) to achieve high-quality FA-based perovskites with simultaneously efficient defects passivation and improved hydrophobicity. It is revealed that SH¯ groups of FTP induce highly oriented crystallization toward (0 0 1) crystal plane of cubic-phase Cs0.05FA0.95PbI3 perovskite structure, thus improving the charge carrier transport. Moreover, a strong Lewis acid-base interaction between the SH¯ group and Pb2+ in perovskite is of great benefit to passivate the surface and grain boundary defects, with additional merit for improving humidity stability of the FA-based perovskite films in conjunction with the hydrophobic group of FTP. The introduction of FTP boosts the efficiency from 20.30% to 22.66% for 0.04 cm2 solar cells and from 16.86% to 20.01% for 1.0 cm2 devices. More importantly, the solar cells demonstrate excellent humidity stability, which can retain 90% of their original efficiency after being kept for 80 days under ambient air conditions.
|Journal||Chemical Engineering Journal|
|State||Published - Apr 1 2022|
Bibliographical noteFunding Information:
This work was supported by the Key Laboratory Foundation of Chinese Academy of Sciences ( 2019LBC ), the Sichuan Science and Technology Program ( 20YYJC4341 ) and National Natural Science Foundation of China under Grant Nos. 61421002 and 61874150 . This work was partially supported by University of Kentucky.
© 2021 Elsevier B.V.
- Anti-solvent strategy
- Defects passivation
- Dual-functional molecules
- FA-based perovskite solar cells
- Humidity stability
ASJC Scopus subject areas
- Chemistry (all)
- Environmental Chemistry
- Chemical Engineering (all)
- Industrial and Manufacturing Engineering