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Solid solution strengthening in GaSb/GaAs: A mode to reduce the TD density through Be-doping

Gutierrez, M; Araujo, D; Jurczak, P; Wu, J; Liu, H; (2017) Solid solution strengthening in GaSb/GaAs: A mode to reduce the TD density through Be-doping. AIP: Applied Physics Letters , 110 (9) , Article 092103. 10.1063/1.4977489. Green open access

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Abstract

The need for a low bandgap semiconductor on a GaAs substrate for thermophotovoltaic applications has motivated research on GaSb alloys, in particular, the control of plastic relaxation of its active layer. Although interfacial misfit arrays offer a possibility of growing strain-free GaSb-based devices on GaAs substrates, a high density of threading dislocations is normally observed. Here, we present the effects of the combined influence of Be dopants and low growth temperature on the threading dislocation density observed by Transmission Electron Microscopy. The Be-related hardening mechanism, occurring at island coalescence, is shown to prevent dislocations to glide and hence reduce the threading dislocation density in these structures. The threading density in the doped GaSb layers reaches the values of seven times less than those observed in undoped samples, which confirms the proposed Be-related hardening mechanism.

Type: Article
Title: Solid solution strengthening in GaSb/GaAs: A mode to reduce the TD density through Be-doping
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4977489
Publisher version: http://dx.doi.org/10.1063/1.4977489
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Science & Technology, Physical Sciences, Physics, Applied, Physics, DISLOCATIONS, GASB, GAAS(001), MISFIT, GAAS, MOBILITY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1551082
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