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Weihua Lin. Portrait.

Weihua Lin

Postdoctoral fellow

Weihua Lin. Portrait.

Tailoring Auger Recombination Dynamics in CsPbI3 Perovskite Nanocrystals via Transition Metal Doping

Author

  • Jie Meng
  • Zhenyun Lan
  • Weihua Lin
  • Ivano E. Castelli
  • Tönu Pullerits
  • Kaibo Zheng

Summary, in English

Auger recombination is a pivotal process for semiconductor nanocrystals (NCs), significantly affecting charge carrier generation and collection in optoelectronic devices. This process depends mainly on the NCs’ electronic structures. In our study, we investigated Auger recombination dynamics in manganese (Mn2+)-doped CsPbI3 NCs using transient absorption (TA) spectroscopy combined with theoretical and experimental structural characterization. Our results show that Mn2+ doping accelerates Auger recombination, reducing the biexciton lifetime from 146 to 74 ps with increasing Mn doping concentration up to 10%. This accelerated Auger recombination in Mn-doped NCs is attributed to increased band edge wave function overlap of excitons and a larger density of final states of Auger recombination due to Mn orbital involvement. Moreover, Mn doping reduces the dielectric screening of the excitons, which also contributes to the accelerated Auger recombination. Our study demonstrates the potential of element doping to regulate Auger recombination rates by modifying the materials’ electronic structure.

Department/s

  • Department of Chemistry
  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • LU Profile Area: Light and Materials
  • eSSENCE: The e-Science Collaboration
  • LTH Profile Area: Photon Science and Technology

Publishing year

2024-07

Language

English

Pages

8386-8393

Publication/Series

Nano Letters

Volume

24

Issue

27

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics
  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Nano-technology

Keywords

  • Auger recombination
  • dielectric screening
  • electronic structures
  • halide perovskite
  • Mn doping

Status

Published

ISBN/ISSN/Other

  • ISSN: 1530-6984