Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations

Xiaoxiao Sun; Yong Zhang; Weikun Ge

doi:10.1038/s41377-022-00957-8

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Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations

Original Articles

- Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations
- Light: Science & Applications Vol. 11, Issue 10, Pages: 2388-2398(2022)
- Affiliations：
  
  1.Laboratory for Thin Films and Photovoltaics, Empa−Swiss Federal Laboratories for Materials Science and Technology, 8600 Duebendorf, Switzerland
  2.Department of Information Technology and Electrical Engineering, ETH Zurich, 8093 Zurich, Switzerland
  3.Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, 01328, Germany
  4.Department of Electrical and Computer Engineering, The University of North Carolina at Charlotte, Charlotte, NC, 28223, USA
  5.Department of Physics, Tsinghua University, Beijing, 10084, People's Republic of China
- Author bio：
  
  Xiaoxiao Sun (x.sun@hzdr.de)
  Yong Zhang (yong.zhang@uncc.edu)
- Funds：
- DOI：10.1038/s41377-022-00957-8
  CLC：
- Published：31 October 2022，
  
  Published Online：07 September 2022，
  
  Received：09 May 2022，
  
  Revised：14 August 2022，
  
  Accepted：16 August 2022
- Accepted：
Scan QR Code
Sun, X. X., Zhang, Y. & Ge, W. K. Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations. Light: Science & Applications, 11, 2388-2398 (2022).
DOI：

Sun, X. X., Zhang, Y. & Ge, W. K. Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations. Light: Science & Applications, 11, 2388-2398 (2022). DOI： 10.1038/s41377-022-00957-8.

摘要

Abstract

Contrary to the common belief that the light-induced halide ion segregation in a mixed halide alloy occurs within the illuminated area

we find that the Br ions released by light are expelled from the illuminated area

which generates a macro/mesoscopic size anion ring surrounding the illuminated area

exhibiting a photoluminescence ring. This intriguing phenomenon can be explained as resulting from two counter-balancing effects: the outward diffusion of the light-induced free Br ions and the Coulombic force between the anion deficit and surplus region. Right after removing the illumination

the macro/mesoscopic scale ion displacement results in a built-in voltage of about 0.4 V between the ring and the center. Then

the displaced anions return to the illuminated area

and the restoring force leads to a damped ultra-low-frequency oscillatory ion motion

with a period of about 20–30 h and lasting over 100 h. This finding may be the first observation of an ionic plasma oscillation in solids. Our understanding and controlling the "ion segregation" demonstrate that it is possible to turn this commonly viewed "adverse phenomenon" into novel electronic applications

such as ionic patterning

self-destructive memory

and energy storage.

关键词

Keywords

references

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