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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

  • Wei Dong
  • Xiaoyu Zhang
  • Fan Yang
  • Qingsen Zeng
  • Wenxu Yin
  • Wei Zhang
  • Haoran Wang
  • Xuyong Yang
  • Stephen V. Kershaw
  • Bai Yang
  • Weitao Zheng

Detail(s)

Original languageEnglish
Pages (from-to)9679–9690
Journal / PublicationACS Nano
Volume16
Issue number6
Online published5 Jun 2022
Publication statusPublished - 28 Jun 2022

Abstract

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.

Research Area(s)

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

Citation Format(s)

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

In: ACS Nano, Vol. 16, No. 6, 28.06.2022, p. 9679–9690.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review