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Title: Atomic-column scanning transmission electron microscopy analysis of misfit dislocations in GaSb/GaAs quantum dots

Abstract

The structural quality of GaSb/GaAs quantum dots (QDs) has been analyzed at atomic scale by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. In particular, we have studied the misfit dislocations that appear because of the high-lattice mismatch in the heterostructure. Our results have shown the formation of Lomer dislocations not only at the interface between the GaSb QDs and the GaAs substrate, but also at the interface with the GaAs capping layer, which is not a frequent observation. The analysis of these dislocations points to the existence of chains of dislocation loops around the QDs. The dislocation core of the observed defects has been characterized, showing that they are reconstructed Lomer dislocations, which have less distortion at the dislocation core in comparison to unreconstructed ones. As a result, strain measurements using geometric phase analysis show that these dislocations may not fully relax the strain due to the lattice mismatch in the GaSb QDs.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Cadiz, Cadiz (Spain)
  3. Lancaster Univ., Lancaster (United Kingdom); Univ. Putra Malaysia, Selangor Darul Ehsan (Malaysia)
  4. Lancaster Univ., Lancaster (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1263886
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 51; Journal Issue: 16; Journal ID: ISSN 0022-2461
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Chisholm, Matthew F., Fernandez-Delgado, N., Herrera, M., Kamarudin, M. A., Zhuang, Q. D., Hayne, M., and Molina, S. I. Atomic-column scanning transmission electron microscopy analysis of misfit dislocations in GaSb/GaAs quantum dots. United States: N. p., 2016. Web. doi:10.1007/s10853-016-0051-0.
Chisholm, Matthew F., Fernandez-Delgado, N., Herrera, M., Kamarudin, M. A., Zhuang, Q. D., Hayne, M., & Molina, S. I. Atomic-column scanning transmission electron microscopy analysis of misfit dislocations in GaSb/GaAs quantum dots. United States. https://doi.org/10.1007/s10853-016-0051-0
Chisholm, Matthew F., Fernandez-Delgado, N., Herrera, M., Kamarudin, M. A., Zhuang, Q. D., Hayne, M., and Molina, S. I. 2016. "Atomic-column scanning transmission electron microscopy analysis of misfit dislocations in GaSb/GaAs quantum dots". United States. https://doi.org/10.1007/s10853-016-0051-0.
@article{osti_1263886,
title = {Atomic-column scanning transmission electron microscopy analysis of misfit dislocations in GaSb/GaAs quantum dots},
author = {Chisholm, Matthew F. and Fernandez-Delgado, N. and Herrera, M. and Kamarudin, M. A. and Zhuang, Q. D. and Hayne, M. and Molina, S. I.},
abstractNote = {The structural quality of GaSb/GaAs quantum dots (QDs) has been analyzed at atomic scale by aberration-corrected high-angle annular dark-field scanning transmission electron microscopy. In particular, we have studied the misfit dislocations that appear because of the high-lattice mismatch in the heterostructure. Our results have shown the formation of Lomer dislocations not only at the interface between the GaSb QDs and the GaAs substrate, but also at the interface with the GaAs capping layer, which is not a frequent observation. The analysis of these dislocations points to the existence of chains of dislocation loops around the QDs. The dislocation core of the observed defects has been characterized, showing that they are reconstructed Lomer dislocations, which have less distortion at the dislocation core in comparison to unreconstructed ones. As a result, strain measurements using geometric phase analysis show that these dislocations may not fully relax the strain due to the lattice mismatch in the GaSb QDs.},
doi = {10.1007/s10853-016-0051-0},
url = {https://www.osti.gov/biblio/1263886}, journal = {Journal of Materials Science},
issn = {0022-2461},
number = 16,
volume = 51,
place = {United States},
year = {2016},
month = {5}
}

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