Silver-Bismuth Bilayer Anode for Perovskite Nanocrystal Light-Emitting Devices
- 21 May 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (10), 3853-3859
- https://doi.org/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 CsPb1-xZnxI3-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.Funding Information
- Ministry of Science and Technology of the People's Republic of China (2017YFB0403601)
- People's Government of Jilin Province (20190101016JH, SXGJXX2017-3)
- Jilin University (SXGJXX2017-3)
- National Natural Science Foundation of China (51772123, 61675086, 61722504, 61935009)
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