Yang Jun-Nan, Wang Jing-Jing, Yin Yi-Chen, Yao Hong-Bin
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230088, China.
Department of Applied Chemistry, Hefei Science Center of Chinese Academy of Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China.
Chem Soc Rev. 2023 Aug 14;52(16):5516-5540. doi: 10.1039/d3cs00179b.
Lead halide perovskite nanocrystals are promising for next-generation high-definition displays, especially in light of their tunable bandgaps, high color purities, and high carrier mobility. Within the past few years, the external quantum efficiency of perovskite nanocrystal-based light-emitting diodes has progressed rapidly, reaching the standard for commercial applications. However, the low operational stability of these perovskite nanocrystal-based light-emitting diodes remains a crucial issue for their industrial development. Recent experimental evidence indicates that the migration of ionic species is the primary factor giving rise to the performance degradation of perovskite nanocrystal-based light-emitting diodes, and ion migration is closely related to the defects on the surface of perovskite nanocrystals and at the grain boundaries of their thin films. In this review, we focus on the central idea of surface reconstruction of perovskite nanocrystals, discuss the influence of surface defects on halide ion migration, and summarize recent advances in resurfacing perovskite nanocrystal strategies toward mitigating halide ion migration to improve the stability of the as-fabricated light-emitting diode devices. From the perspective of perovskite nanocrystal resurfacing, we set out a promising research direction for improving both the spectral and operational stability of perovskite nanocrystal-based light-emitting diodes.
卤化铅钙钛矿纳米晶体在下一代高清显示器方面具有广阔前景，特别是鉴于其可调节的带隙、高色纯度和高载流子迁移率。在过去几年中，基于钙钛矿纳米晶体的发光二极管的外量子效率取得了快速进展，达到了商业应用的标准。然而，这些基于钙钛矿纳米晶体的发光二极管的低操作稳定性仍然是其工业发展的一个关键问题。最近的实验证据表明，离子物种的迁移是导致基于钙钛矿纳米晶体的发光二极管性能下降的主要因素，并且离子迁移与钙钛矿纳米晶体表面及其薄膜晶界处的缺陷密切相关。在这篇综述中，我们聚焦于钙钛矿纳米晶体表面重构的核心思想，讨论表面缺陷对卤离子迁移的影响，并总结最近在重构钙钛矿纳米晶体策略方面取得的进展，以减轻卤离子迁移，从而提高所制备的发光二极管器件的稳定性。从钙钛矿纳米晶体表面重构的角度出发，我们为提高基于钙钛矿纳米晶体的发光二极管的光谱稳定性和操作稳定性提出了一个有前景的研究方向。
