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Updated: Sep 18, 2025
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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
Published on: May 23, 2017
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Unveiling Nanoscale Heterogeneity of Strain in MAPbI3 Perovskite Films Using Bragg Coherent X-Ray Diffraction Imaging
Dong Liang1,2, Zhengtong Yao1, Jiecheng Diao3
1School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 23, 2025
Summary
Cesium alloying and nano-structured substrates regulate strain in methylammonium lead iodide (MAPbI3) perovskite films. Combining both methods enhances structural stability by creating homogeneous nanoscale strain.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Physics
Background:
- Controlling strain in perovskite films is crucial for device performance.
- Macroscale strain characterization is established, but nanoscale insights remain limited.
- Understanding nanoscale strain is key for comprehensive strain regulation.
Purpose of the Study:
- To investigate nanoscale strain regulation in methylammonium lead iodide (MAPbI3) perovskite films.
- To explore the effects of Cesium (Cs) alloying and nano-structured substrates on strain.
- To enhance the structural stability of perovskite films through strain engineering.
Main Methods:
- Laboratory X-ray diffraction (XRD) analysis.
- Bragg coherent X-ray diffraction imaging (BCDI).
- Employing Cs alloying and nano-structured substrates.
Main Results:
- Cs alloying induces compressive strain, while nano-structured substrates induce tensile strain in MAPbI3 films.
- 3 at% Cs alloying disrupts nanoscale strain homogeneity, creating coexisting compressive and tensile domains.
- Nano-structured substrates lead to nanoscale strain heterogeneity.
- Combined Cs alloying and nano-structured substrates achieve strain homogeneity, enhancing structural stability.
Conclusions:
- Nanoscale strain characterization provides critical insights into strain regulation mechanisms.
- Combining Cs alloying and nano-structured substrates offers a pathway to enhance perovskite film stability.
- This work demonstrates 3D nanoscale strain monitoring for advanced strain regulation in perovskites.
Keywords:
3D nanoscale strain mappingbragg coherent X‐ray diffraction imaging (BCDI)long‐term stabilityperovskite filmsMore Related Videos
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