Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 11, Issue 27, Pages 9144-9152Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3tc01028g
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TEAPF(6) doping improves the crystal quality and stability of perovskite films, leading to a higher efficiency of perovskite solar cells.
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 TEAPF(6) into perovskite films as an excellent additive. TEAPF(6) 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. TEAPF(6) 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 TEAPF(6) achieved a PCE of 22.13%. Moreover, TEAPF(6) 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.
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