期刊
NEW JOURNAL OF PHYSICS
卷 23, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac02e0
关键词
ferroelastic; domains; BCDI; twinning; coherent x-ray imaging; perovskites; synchrotron
资金
- Swedish Research Council (VR)
- Swedish Foundation for Strategic Research (SSF)
- European Research Council (ERC) under the European Union Horizon 2020 research and innovation program [801847]
- Olle Engkvist foundation
- Swedish Research council [2018-07152]
- Swedish Governmental Agency for Innovation Systems [2018-04969]
- Formas [2019-02496]
The study investigated twinned ferroelastic domains in single 500 nm CsPbBr3 particles using 3D Bragg coherent X-ray diffraction imaging, unveiling a preferential double-domain structure and suggesting the possibility of a deterministic formation process. The results provide valuable insights for both improving the performance of perovskite-based devices and understanding ferroelastic nanoscale materials, paving the way for real-time imaging of domain dynamics in ferroic systems.
Metal halide perovskites attract significant interest due to their remarkable performance in optoelectronic devices. However, the gap in understanding the relationship between their nanoscale structure and properties limits their application towards novel devices. In this work, twinned ferroelastic domains in single 500 nm CsPbBr3 particles are studied with 3D Bragg coherent x-ray diffraction imaging. A preferential double-domain structure is revealed in four identical particles, with one domain oriented along the [110] and the other along the [002] direction. The particles exhibit similar scattering volume ratios of 0.12 +/- 0.026 between twin phases, suggesting the possibility of a deterministic formation process. The domains exhibit a difference in lattice tilt of 0.59 degrees, in excellent agreement with calculations of the lattice mismatch at the (112) twin boundary. These results provide important insights both for the fundamental understanding of ferroelastic nanoscale materials and for the performance improvement of perovskite-based devices. Moreover, this work paves the way towards real-time imaging of the domain dynamics in ferroic systems.
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