材料科学
发光二极管
光电子学
碳纤维
图层(电子)
氢
胺气处理
纳米技术
复合材料
化学
复合数
有机化学
作者
Wei Dong,Xiaoyu Zhang,Fan Yang,Qingsen Zeng,Wenxu Yin,Wei Zhang,Haoran Wang,Xuyong Yang,Stephen V. Kershaw,Bai Yang,Andrey L. Rogach,Weitao Zheng
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-06-05
卷期号:16 (6): 9679-9690
被引量:47
标识
DOI:10.1021/acsnano.2c03064
摘要
Close attention to the interfaces of solution-processed metal halide perovskite-based light-emitting devices (LEDs) is crucial for their optimal performance. Solution processing of these devices typically leads to the formation of van der Waals interfaces with a weak connection between different functional layers, leaving great room for improvement in charge transport through strengthening of the interlayer interaction. Here, we have realized a hydrogen-bond-assisted interface that makes use of ultrasmall amine-terminated carbon dots to enhance the interaction between the hole transport layer made of PEDOT:PSS and the hybrid lead bromide perovskite emitting layer, which not only promotes the hole injection efficiency but also orients the quasi-2D perovskite crystals penetrating the vertical direction of the device without any, or very few, horizontal grain boundaries, which has a profound effect on the photophysical and transport properties of the emitting layer. As a result, LEDs based on quasi-2D perovskites show up to 24.5% external quantum efficiency, 80 000 cd m-2 brightness, and over 5-fold extended longevity.
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