Repository logo
 

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

Published version

Published version
Peer-reviewed

Repository DOI


Change log

Authors

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

Abstract

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.

Description

Funder: King Abdullah University of Science and Technology; doi: http://dx.doi.org/10.13039/501100004052


Funder: U.S. Department of Energy; doi: http://dx.doi.org/10.13039/100000015


Funder: Office of Science; doi: http://dx.doi.org/10.13039/100006132


Funder: HORIZON EUROPE European Research Council; doi: http://dx.doi.org/10.13039/100019180


Funder: China Scholarship Council; doi: http://dx.doi.org/10.13039/501100004543


Funder: British Spanish Society


Funder: Sir Richard Stapley Educational Trust; doi: http://dx.doi.org/10.13039/501100016406


Funder: Rank Prize Fund


Funder: Winton Sustainability Fund


Funder: George and Lilian Schiff Foundation


Funder: Ernest Oppenheimer Early Career Fellowship


Funder: Schmidt Science Fellowship

Keywords

coherent X-ray diffraction imaging, dislocations, halide perovskite

Journal Title

Adv Mater

Conference Name

Journal ISSN

0935-9648
1521-4095

Volume Title

Publisher

Wiley
Sponsorship
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)