Issue 27, 2023

Multifunctional pseudohalide-based ionic liquid doping promotes efficient and stable perovskite solar cells

Abstract

High-quality perovskite films are crucial to realizing high-efficiency stable perovskite solar cells. Doping is a direct and effective strategy to passivate defects and improve the crystal quality of perovskite films. Herein, we introduce pseudohalide-based ionic liquid TEAPF6 into perovskite films as an excellent additive. TEAPF6 doping has multiple effects: the PF6 anion could fill the halide vacancies, which helps to suppress ion migration through vacancies. The highly electronegative PF6 could bind with uncoordinated Pb2+ and organic cations to passivate defects. TEAPF6 doping improved the crystal quality and suppressed the charge recombination in perovskite films. More importantly, the TEA+ with long alkyl groups and PF6 could enhance the hydrophobicity of the perovskite films. As a result, the device with TEAPF6 achieved a PCE of 22.13%. Moreover, TEAPF6 doping enhanced the stability of PSCs. This work demonstrates the excellent effect of pseudohalide-based ionic liquid doping on improving the crystal quality of perovskite films.

Graphical abstract: Multifunctional pseudohalide-based ionic liquid doping promotes efficient and stable perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
23 mar 2023
Accepted
30 may 2023
First published
01 iyn 2023

J. Mater. Chem. C, 2023,11, 9144-9152

Multifunctional pseudohalide-based ionic liquid doping promotes efficient and stable perovskite solar cells

X. Guo, Z. Lin, W. Cao, Y. Xu, Q. Wang, B. Zhang, Y. Hao and J. Chang, J. Mater. Chem. C, 2023, 11, 9144 DOI: 10.1039/D3TC01028G

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