Imaging Light‐Induced Migration of Dislocations in Halide Perovskites with 3D Nanoscale Strain Mapping
Year: 2023
Type: article
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 MAPbBr 3 (MA = CH 3 NH 3 + ) 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.
Source: Advanced Materials
Authors: Kieran W. P. Orr, Jiecheng Diao, Muhammad Naufal Lintangpradipto, Darren J. Batey, Affan N. Iqbal, Simon Kahmann, Kyle Frohna, Milos Dubajic, Szymon J. Zelewski, Alice E. Dearle, Thomas A. Selby, Peng Li, Tiarnan A. S. Doherty, Stephan Hofmann, Osman M. Bakr, Ian K. Robinson, Samuel D. Stranks
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,250
Funders: U.S. Department of Energy, Diamond Light Source, Leverhulme Trust, Royal Society, European Commission, King Abdullah University of Science and Technology, China Scholarship Council, Isaac Newton Trust, Tata Sons, Narodowa Agencja Wymiany Akademickiej, Sir Richard Stapley Educational Trust, Office of Science, Engineering and Physical Sciences Research Council, Basic Energy Sciences, Brookhaven National Laboratory, H2020 European Research Council, HORIZON EUROPE European Research Council
Awards: G1210759672, G1285306620, G1847291448, G1868695577, G23738330, G241279073, G2456967146, G2573146754, EPSRC Centre for Doctoral Training in Integrated Functional Nano (i4Nano), G3262563802, G3302042926, Cambridge-AMOLF Collaboration on Photonic and Optoelectronic Control of Thin-Film LEDs and Solar Cells, G357145406, G367224153, G3850097093, Expanding the Environmental Frontiers of Operando Metrology for Advanced Device Materials Development, G4065822584, G4298533165, G434337789, G4662383146, G4972998915, G5417557083, G5438070526, G5464303716, G5633341255, G5728601243, G5765906131, G6051805555, G6083127429, G609424679, G639253739, G6733788163, G6965541988, G6980157865, G7235047266, EPSRC Centre for Doctoral Training in Sustainable and Functional Nano, G7463374569, G7558375840, G7707145192, The Origin of Non-Radiative Losses in Metal Halide Perovskites, G8069729576, HYbrid PERovskites for Next GeneratION Solar Cells and Lighting, G8858639103
OpenAlex ID: W4386932020