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

Author

Listed:
  • Yuwei Guo

    (The Chinese University of Hong Kong)

  • Sofia Apergi

    (Eindhoven University of Technology
    Eindhoven University of Technology)

  • Nan Li

    (The Chinese University of Hong Kong)

  • Mengyu Chen

    (The Chinese University of Hong Kong
    Xiamen University)

  • Chunyang Yin

    (Linköping University)

  • Zhongcheng Yuan

    (Linköping University)

  • Feng Gao

    (Linköping University)

  • Fangyan Xie

    (Sun Yat-sen University)

  • Geert Brocks

    (Eindhoven University of Technology
    Eindhoven University of Technology
    University of Twente)

  • Shuxia Tao

    (Eindhoven University of Technology
    Eindhoven University of Technology)

  • Ni Zhao

    (The Chinese University of Hong Kong)

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.

Suggested Citation

  • Yuwei Guo & Sofia Apergi & Nan Li & Mengyu Chen & Chunyang Yin & Zhongcheng Yuan & Feng Gao & Fangyan Xie & Geert Brocks & Shuxia Tao & Ni Zhao, 2021. "Phenylalkylammonium passivation enables perovskite light emitting diodes with record high-radiance operational lifetime: the chain length matters," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-20970-6
    DOI: 10.1038/s41467-021-20970-6
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