Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime: the chain length matters

Yuwei Guo, Sofia Apergi, Nan Li, Mengyu Chen, Chunyang Yin, Zhongcheng Yuan, Feng Gao, Fangyan Xie, Geert Brocks, Shuxia Tao () and Ni Zhao ()
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Yuwei Guo: The Chinese University of Hong Kong
Sofia Apergi: Eindhoven University of Technology
Nan Li: The Chinese University of Hong Kong
Mengyu Chen: The Chinese University of Hong Kong
Chunyang Yin: Linköping University
Zhongcheng Yuan: Linköping University
Feng Gao: Linköping University
Fangyan Xie: Sun Yat-sen University
Geert Brocks: Eindhoven University of Technology
Shuxia Tao: Eindhoven University of Technology
Ni Zhao: The Chinese University of Hong Kong

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Perovskite light emitting diodes suffer from poor operational stability, exhibiting a rapid decay of external quantum efficiency within minutes to hours after turn-on. To address this issue, we explore surface treatment of perovskite films with phenylalkylammonium iodide molecules of varying alkyl chain lengths. Combining experimental characterization and theoretical modelling, we show that these molecules stabilize the perovskite through suppression of iodide ion migration. The stabilization effect is enhanced with increasing chain length due to the stronger binding of the molecules with the perovskite surface, as well as the increased steric hindrance to reconfiguration for accommodating ion migration. The passivation also reduces the surface defects, resulting in a high radiance and delayed roll-off of external quantum efficiency. Using the optimized passivation molecule, phenylpropylammonium iodide, we achieve devices with an efficiency of 17.5%, a radiance of 1282.8 W sr−1 m−2 and a record T50 half-lifetime of 130 h under 100 mA cm−2.

Date: 2021
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DOI: 10.1038/s41467-021-20970-6

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