钝化
光电子学
钙钛矿(结构)
材料科学
电介质
二极管
发光二极管
工程物理
纳米技术
化学工程
图层(电子)
工程类
作者
Xuanchi Yu,Zhaojin Wang,Yulin Mao,Chengwei Shan,Fengshou Tian,Bingheng Meng,Zhaojin Wang,Tianqi Zhang,Aung Ko Ko Kyaw,Zhaojin Wang,Xiaowei Sun,Kai Wang,Rui Chen,Zhipeng Wei
标识
DOI:10.1007/s40820-024-01405-5
摘要
Metal halide perovskites, particularly the quasi-two-dimensional perovskite subclass, have exhibited considerable potential for next-generation electroluminescent materials for lighting and display. Nevertheless, the presence of defects within these perovskites has a substantial influence on the emission efficiency and durability of the devices. In this study, we revealed a synergistic passivation mechanism on perovskite films by using a dual-functional compound of potassium bromide. The dual functional potassium bromide on the one hand can passivate the defects of halide vacancies with bromine anions and, on the other hand, can screen the charged defects at the grain boundaries with potassium cations. This approach effectively reduces the probability of carriers quenching resulting from charged defects capture and consequently enhances the radiative recombination efficiency of perovskite thin films, leading to a significant enhancement of photoluminescence quantum yield to near-unity values (95%). Meanwhile, the potassium bromide treatment promoted the growth of homogeneous and smooth film, facilitating the charge carrier injection in the devices. Consequently, the perovskite light-emitting diodes based on this strategy achieve a maximum external quantum efficiency of ~ 21% and maximum luminance of ~ 60,000 cd m
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