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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Photodetector Based on Spontaneously Grown Strongly Coupled MAPbBr3/N-rGO Hybrids Showing Enhanced Performance

Author

  • Yingying Tang
  • Mingli Liang
  • Minwei Zhang
  • Alireza Honarfar
  • Xianshao Zou
  • Mohamed Abdellah
  • Tönu Pullerits
  • Kaibo Zheng
  • Qijin Chi

Summary, in English

Recently, metal-halide perovskites have emerged as a candidate for optoelectronic applications such as photodetectors. However, the poor device performance and instability have limited their future commercialization. Herein, we report the spontaneous growth of perovskite/N-rGO hybrid structures using a facile solution method and their applications for photodetectors. In the hybrid structures, perovskites were homogeneously wrapped by N-rGO sheets through strong hydrogen bonding. The strongly coupled N-rGOs facilitate the charge carrier transportation across the perovskite crystals but also distort the surface lattice of the perovskite creating a potential barrier for charge transfer. We optimize the addition of N-rGO in the hybrid structures to balance interfacial structural distortion and the intercrystal conductivity. High-performance photodetection up to 3 × 104 A/W, external quantum efficiency exceeding 105%, and detectivity up to 1012 Jones were achieved in the optimal device with the weight ratio between perovskites and N-rGO to be 8:1.5. The underlying mechanism behind the optimal N-rGO addition ratio in the hybrids has also been rationalized via time-resolved spectroscopic studies as a reference for future applications.

Department/s

  • NanoLund: Center for Nanoscience
  • Chemical Physics

Publishing year

2020-01-08

Language

English

Pages

858-867

Publication/Series

ACS Applied Materials and Interfaces

Volume

12

Issue

1

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Theoretical Chemistry
  • Condensed Matter Physics

Keywords

  • hybrid material
  • hydrogen bonding
  • perovskite/N-rGO
  • photodetector
  • time-resolved spectroscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 1944-8244