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The Relationship Between Atomic Structure and Strain Distribution of Misfit Dislocation Cores at Cubic Heteroepitaxial Interfaces

Published online by Cambridge University Press:  09 March 2017

Cai Wen
Cai Wen*
Affiliation:
School of Science, Southwest University of Science and Technology, Mianyang 621010, China Department of Physics, Arizona State University, Tempe, AZ 85287, USA
*
*Corresponding author. wencai@swust.edu.cn
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Abstract

The atomic reconstruction of a misfit dislocation (MD) core causes change in the strain distribution around the core. Several MD cores at the AlSb/GaAs (001) cubic zincblende interface, including a symmetrical glide set Lomer dislocation (LD), a left-displaced glide set LD, a glide set LD with an atomic step, a symmetrical shuffle set LD, and a 60° dislocation pair, were studied using simulated projected potential and aberration-corrected transmission electron microscope images. Image deconvolution was also used to restore structure images from nonoptimum-defocus images. The corresponding biaxial strain maps, εxx (in-plane) and εyy (out-of-plane), were obtained by geometric phase analysis using the GaAs substrate as the reference lattice. The results show that atomic structure characteristics of MD cores can be revealed by the strain maps. The strain maps should be measured from optimum-defocus images or restored structure images. Furthermore, the εxx strain map has been found more accurate than the εyy strain map for MD cores, and the specimen thickness should be below the critical thickness due to the influence of dynamical scattering.

Keywords

misfit dislocationatomic structurestrain distributionhigh-resolution electron microscopygeometric phase analysis
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 23 , Issue 3 , June 2017 , pp. 449 - 459
Copyright
© Microscopy Society of America 2017 

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