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Updated: Aug 8, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
Published on: May 28, 2016
Computation of the strain field generated by dislocations with a position-dependent Burgers' vector distribution
1INFM-TASC at Elettra Synchrotron Light Source, Basovizza Trieste, Italy. romanato@sci.area.trieste.it
Abstract:
A new phenomenon of strain relaxation will be presented. In a series of InxGa1-xAs graded composition buffer layers grown on well cut (001) GaAs substrates, a curvature of the epilayer lattice has been found, i.e. a tilt of the epilayer lattice orientation with respect to the substrate which varies coherently along the sample surface on the scale of several mm. The most recent data analysis performed on a buffer layer compositionally graded with a six-step profile shows also a thickness functional dependence of the curvature. The epilayer lattice curvature has been attributed to a coherent lateral distribution of the Burgers' vectors. An analytical model has been developed in the framework of the continuum elasticity theory to compute the related strain field. The results show small but unexpected contributions to the parallel strain.
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