Improved charge balance in green perovskite light-emitting diodes with atomic layer-deposited Al2O3

Journal article : Review

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.

Authors: Gunnarsson, WB; Xu, Z; Noel, NK; Rand, BP

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Chemical Society
• Journal: ACS Applied Materials and Interfaces
• Volume: 14
• Issue: 30
• Pages: 34247-34252
• Publication date: 2022-03-30
• Acceptance date: 2022-03-30
• DOI: 10.1021/acsami.2c00860
• EISSN: 1944-8252
• ISSN: 1944-8244
• Pmid: 35353475
• Language: English
• Keywords: metal halide perovskite; charge balance; LED; ZnO; FFR; Al2O3; atomic layer deposition; CsPbBr3
• Subtype: Review