Fabrication of the high-performance perovskite optoelectronic devices
Zhanhua Wei a
a Huaqiao University
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Invited Speaker, Zhanhua Wei, presentation 035
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.035
Publication date: 4th December 2020

Metal halide perovskite materials are an emerging class of solution-processed semiconductors with considerable potential for use in optoelectronic devices. For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could to provide tunable colors and narrow emission linewidths at high photoluminescence quantum yields. However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are still well behind the performance of organic LEDs and inorganic quantum dot LEDs. Here we describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20%. This achievement stems from a new strategy for managing the compositional distribution in the device—an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, we mixed a pre-synthesized CsPbBr3 perovskite with a MABr additive (where MA is CH3NH3), the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3% external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display.

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