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Imaging light-induced migration of dislocations in halide perovskites with 3D nanoscale strain mapping

DOI: 10.1002/adma.202305549 DOI Help
Data DOI: 10.17863/CAM.101790 Data DOI Help

Authors: Kieran W. P. Orr (University of Cambridge) , Jiecheng Diao (University College London) , Muhammad Naufal Lintangpradipto (King Abdullah University of Science and Technology (KAUST)) , Darren J. Batey (Diamond Light Source) , Affan N. Iqbal (University of Cambridge) , Simon Kahmann (University of Cambridge) , Kyle Frohna (University of Cambridge) , Milos Dubajic (University of Cambridge) , Szymon J. Zelewski (University of Cambridge) , Alice E. Dearle (University of Cambridge) , Thomas A. Selby (University of Cambridge) , Peng Li (Diamond Light Source) , Tiarnan A. S. Doherty (University of Cambridge) , Stephan Hofmann (University of Cambridge) , Osman M. Bakr (King Abdullah University of Science and Technology (KAUST)) , Ian K. Robinson (Brookhaven National Laboratory) , Samuel D. Stranks (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials

State: Published (Approved)
Published: September 2023
Diamond Proposal Number(s): 25097 , 28495 , 30308

Open Access Open Access

Abstract: In recent years, halide perovskite materials have been used to make high performance solar cell and light-emitting devices. However, material defects still limit device performance and stability. Here, we use synchrotron-based Bragg Coherent Diffraction Imaging to visualise nanoscale strain fields, such as those local to defects, in halide perovskite microcrystals. We find significant strain heterogeneity within MAPbBr3 (MA = CH3NH3+) crystals in spite of their high optoelectronic quality, and identify both 〈100〉 and 〈110〉 edge dislocations through analysis of their local strain fields. By imaging these defects and strain fields in situ under continuous illumination, we uncover dramatic light-induced dislocation migration across hundreds of nanometers. Further, by selectively studying crystals that are damaged by the X-ray beam, we correlate large dislocation densities and increased nanoscale strains with material degradation and substantially altered optoelectronic properties assessed using photoluminescence microscopy measurements. Our results demonstrate the dynamic nature of extended defects and strain in halide perovskites, which will have important consequences for device performance and operational stability.

Diamond Keywords: Photovoltaics; Semicoductors

Subject Areas: Materials, Physics, Energy


Instruments: I13-1-Coherence

Added On: 24/09/2023 10:55

Documents:
Advanced Materials - 2023 - Orr.pdf

Discipline Tags:

Earth Sciences & Environment Sustainable Energy Systems Energy Physics Climate Change Electronics Energy Materials Materials Science Perovskites Metallurgy

Technical Tags:

Imaging Coherent Diffraction Imaging (CDI) Bragg CDI