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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Guo Y,Apergi S,Li N,Chen M,Yin C,Yuan Z,Gao F,Xie F,Brocks G,Tao S,Zhao Ndoi
10.1038/s41467-021-20970-6subject
Has Abstractpub_date
2021-01-28 00:00:00pages
644issue
1issn
2041-1723pii
10.1038/s41467-021-20970-6journal_volume
12pub_type
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