Amine-Terminated Carbon Dots Linking Hole Transport Layer and Vertically Oriented Quasi-2D Perovskites through Hydrogen Bonds Enable Efficient LEDs

作者：Dong, Wei; Zhang, Xiaoyu^*; Yang, Fan; Zeng, Qingsen; Yin, Wenxu; Zhang, Wei; Wang, Haoran; Yang, Xuyong; Kershaw, Stephen, V; Yang, Bai; Rogach, Andrey L.^*; Zheng, Weitao^*

来源：ACS Nano, 2022, 16(6): 9679-9690.

DOI：10.1021/acsnano.2c03064

• quasi-2D perovskites
• light-emitting device
• carbon dots
• interface
• hydrogen bonds

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.

• 单位
  上海大学; 吉林大学