Improved Charge Balance in Green Perovskite Light-Emitting Diodes with Atomic-Layer-Deposited Al2O3

William B. Gunnarsson, Zhaojian Xu, Nakita K. Noel, Barry P. Rand

Research output: Contribution to journalReview articlepeer-review

Abstract

Perovskite light-emitting diodes (LEDs) have experienced a rapid increase in efficiency over the last several years and are now regarded as promising low-cost devices for displays and communication systems. However, it is often challenging to employ ZnO, a well-studied electron transport material, in perovskite LEDs due to chemical instability at the ZnO/perovskite interface and charge injection imbalance caused by the relatively high conductivity of ZnO. In this work, we address these problems by depositing an ultrathin Al2O3 interlayer at the ZnO/perovskite interface, allowing the fabrication of green-emitting perovskite LEDs with a maximum luminance of 21' »815 cd/m2. Using atomic layer deposition, we can precisely control the Al2O3 thickness and thus fine-tune the electron injection from ZnO, allowing us to enhance the efficiency and operational stability of our LEDs.

Original languageEnglish (US)
JournalACS Applied Materials and Interfaces
DOIs
StateAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • AlO
  • atomic layer deposition
  • charge balance
  • CsPbBr
  • LED
  • metal halide perovskite
  • ZnO

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