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Huaiyu Chen

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Effects of local compositional heterogeneity in mixed halide perovskites on blue electroluminescence

Author

  • Xiyu Luo
  • Weidong Xu
  • Guanhaojie Zheng
  • Sandhya Tammireddy
  • Qi Wei
  • Max Karlsson
  • Zhaojun Zhang
  • Kangyu Ji
  • Simon Kahmann
  • Chunyang Yin
  • Yatao Zou
  • Zeyu Zhang
  • Huaiyu Chen
  • Lucas A.B. Marçal
  • Haifeng Zhao
  • Dongxin Ma
  • Dongdong Zhang
  • Yue Lu
  • Mingjie Li
  • Carsten Deibel
  • Samuel D. Stranks
  • Lian Duan
  • Jesper Wallentin
  • Wei Huang
  • Feng Gao
Show all

Summary, in English

Compositional heterogeneity is commonly observed in mixed bromide/iodide perovskite photoabsorbers, typically with minimal effects on charge carrier recombination and photovoltaic performance. Consistently, it has so far received very limited attention in bromide/chloride-mixed perovskites, which hold particular significance for blue light-emitting diodes. Here, we uncover that even a minor degree of localized halide heterogeneity leads to severe non-radiative losses in mixed bromide/chloride blue perovskite emitters, presenting a stark contrast to general observations in photovoltaics. We not only provide a visualization of the heterogeneity landscape spanning from micro-to sub-microscale but also identify that this issue mainly arises from the initially formed chloride-rich clusters during perovskite nucleation. Our work sheds light on a long-term neglected factor impeding the advancement of blue light-emitting diodes using mixed halide perovskites and provides a practical strategy to mitigate this issue.

Department/s

  • LU Profile Area: Light and Materials
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • Synchrotron Radiation Research
  • NanoLund: Centre for Nanoscience
  • eSSENCE: The e-Science Collaboration
  • MAX IV Laboratory

Publishing year

2024

Language

English

Pages

1054-1070

Publication/Series

Matter

Volume

7

Issue

3

Document type

Journal article

Publisher

Cell Press

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Keywords

  • blue perovskite light-emitting diodes
  • local compositional heterogeneity
  • MAP 3: Understanding
  • mixed halide perovskites

Status

Published

ISBN/ISSN/Other

  • ISSN: 2590-2393