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Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime: the chain length matters
Chinese Univ Hong Kong, Peoples R China.
Eindhoven Univ Technol, Netherlands.
Chinese Univ Hong Kong, Peoples R China.
Chinese Univ Hong Kong, Peoples R China; Xiamen Univ, Peoples R China.
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2021 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 12, no 1, article id 644Article in journal (Refereed) Published
Abstract [en]

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 T-50 half-lifetime of 130h under 100mAcm(-2). Perovskite light emitting diodes suffer from operational stability, showing rapid decay of performance within minutes to hours after turn-on. Here, the authors investigate how the steric and Coulomb interaction of ammonium passivation molecules with varying alkyl chain length can improve device stability by suppressing iodide ion migration.

Place, publisher, year, edition, pages
Nature Research , 2021. Vol. 12, no 1, article id 644
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-174151DOI: 10.1038/s41467-021-20970-6ISI: 000616784300005PubMedID: 33510190OAI: oai:DiVA.org:liu-174151DiVA, id: diva2:1537223
Note

Funding Agencies|General Research Fund (RGC) [14307819]; NSFC/RGC Joint Research Scheme from the Research Grants Council of Hong Kong [N_CUHK449/19]; NWO START-UP; NWONetherlands Organization for Scientific Research (NWO) [15CST04-2]; Computational Sciences for Energy Research (CSER) tenure track program of Shell

Available from: 2021-03-15 Created: 2021-03-15 Last updated: 2023-03-28

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Yin, ChunyangYuan, ZhongchengGao, Feng
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