Unveiling the interaction mechanisms of electron and X-ray radiation with halide perovskite semiconductors using scanning nanoprobe diffraction
Author(s)
Type
Journal Article
Abstract
The interaction of high-energy electrons and X-ray photons with beam-sensitive semiconductors such as halide perovskites is essential for the characterization and understanding of these optoelectronic materials. Using nanoprobe diffraction techniques, which can investigate physical properties on the nanoscale, studies of the interaction of electron and X-ray radiation with state-of-the-art (FA0.79 MA0.16 Cs0.05 )Pb(I0.83 Br0.17 )3 hybrid halide perovskite films (FA, formamidinium; MA, methylammonium) are performed, tracking the changes in the local crystal structure as a function of fluence using scanning electron diffraction and synchrotron nano X-ray diffraction techniques. Perovskite grains are identified, from which additional reflections, corresponding to PbBr2 , appear as a crystalline degradation phase after fluences of 200 e- Å- 2 . These changes are concomitant with the formation of small PbI2 crystallites at the adjacent high-angle grain boundaries, with the formation of pinholes, and with a phase transition from tetragonal to cubic. A similar degradation pathway is caused by photon irradiation in nano-X-ray diffraction, suggesting common underlying mechanisms. This approach explores the radiation limits of these materials and provides a description of the degradation pathways on the nanoscale. Addressing high-angle grain boundaries will be critical for the further improvement of halide polycrystalline film stability, especially for applications vulnerable to high-energy radiation such as space photovoltaics.
Date Issued
2022-05-05
Date Acceptance
2022-03-01
Citation
Advanced Materials, 2022, 34 (18)
ISSN
0935-9648
Publisher
Wiley
Journal / Book Title
Advanced Materials
Volume
34
Issue
18
Copyright Statement
© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/35288992
Subjects
high-energy beam damage
lead halide perovskites
nanoprobe diffraction
nano-X-ray diffraction
scanning electron diffraction
Publication Status
Published
Coverage Spatial
Germany
Article Number
2200383
Date Publish Online
2022-03-14