Silver-Bismuth Bilayer Anode for Perovskite Nanocrystal Light-Emitting Devices

Xinyu Shen; Xiang Zhang; Chengyuan Tang; Xiangtong Zhang; Po Lu; Zhifeng Shi; Wenfa Xie; William W Yu; Yu Zhang

doi:10.1021/acs.jpclett.0c00907

Silver-Bismuth Bilayer Anode for Perovskite Nanocrystal Light-Emitting Devices

J Phys Chem Lett. 2020 May 21;11(10):3853-3859. doi: 10.1021/acs.jpclett.0c00907. Epub 2020 May 1.

Authors

Xinyu Shen¹, Xiang Zhang¹, Chengyuan Tang¹, Xiangtong Zhang¹, Po Lu¹, Zhifeng Shi², Wenfa Xie¹, William W Yu³, Yu Zhang¹

Affiliations

¹ State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
² Key Laboratory of Materials Physics of Ministry of Education, Department of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China.
³ Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana 71115, United States.

PMID: 32343898
DOI: 10.1021/acs.jpclett.0c00907

Abstract

Perovskite nanocrystal light-emitting devices (PNC LEDs) exhibit great potential in display and lighting applications. Balanced hole and electron injection in the light-emitting layer is undoubtedly an effective way to improve LED performance. Here, bismuth (Bi) was introduced into PNC LEDs to form a silver-bismuth (Ag-Bi) bilayer anode. Ag diffused into a defective 2 nm thick Bi layer to form an alloy-like state that promoted hole injection, reduced the charge transfer resistance, and enhanced charge transfer, leading to more balanced hole-electron carriers in the emission layer through hole injection enhancement. As a result, the turn-on voltage and brightness changed from 2.41 V and 2200 cd m^-2, respectively, for CsPb_1-xZn_xI₃-based LEDs with a Ag monolayer anode to 2.2 V and 3714 cd m^-2, respectively, for devices with a Ag-Bi bilayer anode. In addition, the performance of CsPbI₃ and CsPbBrI₂ PNC-based LEDs has also been effectively improved by using a Ag-Bi bilayer anode.