Abstract
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.
Original language | English |
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Article number | 133227 |
Journal | Chemical Engineering Journal |
Volume | 433 |
DOIs | |
State | Published - Apr 1 2022 |
Bibliographical note
Publisher Copyright:© 2021 Elsevier B.V.
Keywords
- Anti-solvent strategy
- Defects passivation
- Dual-functional molecules
- FA-based perovskite solar cells
- Humidity stability
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering