Issue 40, 2021

Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment

Abstract

Mixed lead–tin (Pb–Sn) halide perovskites with optimum band gaps near 1.3 eV are promising candidates for next-generation solar cells. However, the performance of solar cells fabricated with Pb–Sn perovskites is restricted by the facile oxidation of Sn(II) to Sn(IV), which induces self-doping. Maltol, a naturally occurring flavor enhancer and strong metal binding agent, was found to effectively suppress Sn(IV) formation and passivate defects in mixed Pb–Sn perovskite films. When used in combination with Sn(IV) scavenging, the maltol surface treatment led to high-quality perovskite films which showed enhanced photoluminescence intensities and charge carrier lifetimes in excess of 7 μs. The scavenging and surface treatments resulted in highly reproducible solar cell devices, with photoconversion efficiencies of up to 21.4% under AM1.5G illumination.

Graphical abstract: Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment

Supplementary files

Article information

Article type
Edge Article
Submitted
01 avq 2021
Accepted
21 sen 2021
First published
27 sen 2021
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2021,12, 13513-13519

Mixed lead–tin perovskite films with >7 μs charge carrier lifetimes realized by maltol post-treatment

S. Hu, M. A. Truong, K. Otsuka, T. Handa, T. Yamada, R. Nishikubo, Y. Iwasaki, A. Saeki, R. Murdey, Y. Kanemitsu and A. Wakamiya, Chem. Sci., 2021, 12, 13513 DOI: 10.1039/D1SC04221A

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