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Aboma Mendasa, MSc, PhD. Photo.

Aboma Merdasa

Researcher

Aboma Mendasa, MSc, PhD. Photo.

The Role of Grain Boundaries on Ionic Defect Migration in Metal Halide Perovskites

Author

  • Nga Phung
  • Amran Al-Ashouri
  • Simone Meloni
  • Alessandro Mattoni
  • Steve Albrecht
  • Eva Unger
  • Aboma Merdasa
  • Antonio Abate

Summary, in English

Halide perovskites are emerging as revolutionary materials for optoelectronics. Their ionic nature and the presence of mobile ionic defects within the crystal structure have a dramatic influence on the operation of thin-film devices such as solar cells, light-emitting diodes, and transistors. Thin films are often polycrystalline and it is still under debate how grain boundaries affect the migration of ions and corresponding ionic defects. Laser excitation during photoluminescence (PL) microscopy experiments leads to formation and subsequent migration of ionic defects, which affects the dynamics of charge carrier recombination. From the microscopic observation of lateral PL distribution, the change in the distribution of ionic defects over time can be inferred. Resolving the PL dynamics in time and space of single crystals and thin films with different grain sizes thus, provides crucial information about the influence of grain boundaries on the ionic defect movement. In conjunction with experimental observations, atomistic simulations show that defects are trapped at the grain boundaries, thus inhibiting their diffusion. Hence, with this study, a comprehensive picture highlighting a fundamental property of the material is provided while also setting a theoretical framework in which the interaction between grain boundaries and ionic defect migration can be understood.

Department/s

  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • Combustion Physics

Publishing year

2020-04-19

Language

English

Publication/Series

Advanced Energy Materials

Volume

10

Issue

20

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Inorganic Chemistry
  • Condensed Matter Physics

Keywords

  • Grain boundaries
  • halide perovskites
  • ion migration
  • molecular dynamic simulations
  • photoluminescence

Status

Published

ISBN/ISSN/Other

  • ISSN: 1614-6832