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TEMPOL-promoted oxygen doping of a polytriarylamine hole-transport layer for efficient and stable lead halide perovskite solar cells

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Abstract

In this study, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPOL) is presented as an additive to modify a polytriarylamine-based hole transport layer (HTL) for perovskite solar cells assembled in a regular n–i–p configuration. When the electrode-free stacks are exposed to air, TEMPOL catalyzes the oxygen doping of the HTL and enhances the photovoltaic performance of the devices. The TEMPOL-induced doping of the polymeric HTL improves the open-circuit voltage and hence the power conversion efficiency of the solar cells, reaching a maximum of 17.5% for the bication Cs0.12FA0.88PbI2.64Br0.36 perovskite absorber. Moreover, TEMPOL shows no negative effect on the photostability of the solar cells, allowing them to reach T80 > 2000 hours under continuous 30 mW cm−2 illumination.

Graphical abstract: TEMPOL-promoted oxygen doping of a polytriarylamine hole-transport layer for efficient and stable lead halide perovskite solar cells

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Article information


Submitted
04 Oct 2019
Accepted
03 Jan 2020
First published
06 Jan 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

TEMPOL-promoted oxygen doping of a polytriarylamine hole-transport layer for efficient and stable lead halide perovskite solar cells

S. Tsarev, O. A. Kraevaya, S. Yu. Luchkin, K. J. Stevenson and P. A. Troshin, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC05439A

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