The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Ivan Scheblykin. Portrait.

Ivan Scheblykin

Professor

Ivan Scheblykin. Portrait.

Spatially Resolved Local Electronic Properties of 2D Lead Halide Perovskite Single Crystals Studied by X-Ray Photoemission Electron Microscopy

Author

  • Mingli Liang
  • Weihua Lin
  • Qian Zhao
  • Jun Li
  • Lin Zhu
  • Brice Sarpi
  • Alexei Zakharov
  • Ivan G. Scheblykin
  • Tönu Pullerits
  • Yuran Niu
  • Sophie E. Canton
  • Kaibo Zheng
Show all

Summary, in English

Recently, research on the edge states of 2D lead halide perovskites (LHPs) has been attracting much attention. The lower-energy edge state (LES) is believed to provide an efficient pathway for the dissociation of photoexcited excitons. However, the mechanism of the LES formation remains controversial, and studies that establish precisely the local electronic properties are lacking. Herein, the first study of spatially resolved electronic structures in 2D LHP single-crystal flakes by X-ray photoemission electron microscopy is presented, specifically identifying the contribution from the edge area. The results show that blueshifts occur in the Pb 5d core-level peaks at the edge area compared to the interior area with much less difference in I 4d core-level peaks. The shift becomes more pronounced as n varies from 1 to 3 (≈0.2–1.0 eV). This phenomenon is attributed to the surface restructuring of the edge area induced by the release of mechanical strain through lattice expansion. This work provides an important reference on the origin of the LES of 2D LHPs and is beneficial for future optoelectronic device applications.

Department/s

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

Publishing year

2023

Language

English

Publication/Series

Solar RRL

Volume

7

Issue

1

Document type

Journal article

Publisher

Wiley-VCH Verlag

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • 2D lead halide perovskites
  • edge states
  • lattice mismatches
  • local electronic properties
  • X-ray photoemission electron microscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 2367-198X