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Imaging Light-Induced Migration of Dislocations in Halide Perovskites with 3D Nanoscale Strain Mapping.

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Diao, Jiecheng 
Lintangpradipto, Muhammad Naufal 
Batey, Darren J 
Iqbal, Affan N 


In recent years, halide perovskite materials have been used to make high-performance solar cells and light-emitting devices. However, material defects still limit device performance and stability. Here, synchrotron-based Bragg coherent diffraction imaging is used to visualize nanoscale strain fields, such as those local to defects, in halide perovskite microcrystals. Significant strain heterogeneity within MAPbBr3 (MA = CH3 NH3 + ) crystals is found in spite of their high optoelectronic quality, and both 〈100〉 and 〈110〉 edge dislocations are identified through analysis of their local strain fields. By imaging these defects and strain fields in situ under continuous illumination, dramatic light-induced dislocation migration across hundreds of nanometers is uncovered. Further, by selectively studying crystals that are damaged by the X-ray beam, large dislocation densities and increased nanoscale strains are correlated with material degradation and substantially altered optoelectronic properties assessed using photoluminescence microscopy measurements. These results demonstrate the dynamic nature of extended defects and strain in halide perovskites, which will have important consequences for device performance and operational stability.


Funder: King Abdullah University of Science and Technology; doi:

Funder: U.S. Department of Energy; doi:

Funder: Office of Science; doi:

Funder: HORIZON EUROPE European Research Council; doi:

Funder: China Scholarship Council; doi:

Funder: British Spanish Society

Funder: Sir Richard Stapley Educational Trust; doi:

Funder: Rank Prize Fund

Funder: Winton Sustainability Fund

Funder: George and Lilian Schiff Foundation

Funder: Ernest Oppenheimer Early Career Fellowship

Funder: Schmidt Science Fellowship


coherent X-ray diffraction imaging, dislocations, halide perovskite

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Adv Mater

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European Research Council (756962)
Royal Society (RGF/EA/180085)
Engineering and Physical Sciences Research Council (EP/L015978/1)
Engineering and Physical Sciences Research Council (EP/R023980/1)
Engineering and Physical Sciences Research Council (EP/S030638/1)
Engineering and Physical Sciences Research Council (EP/S022953/1)
EPSRC (EP/T001038/1)
Engineering and Physical Sciences Research Council (2275833)