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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/32069
Title: Limited In incorporation during pseudomorphic InAs/GaAs growth and quantum dot formation observed by in situ stress measurements
Authors: Silveira, Juan Pedro; García Martínez, Jorge Manuel; Briones Fernández-Pola, Fernando
Keywords: Stress
Molecular beam epitaxy
Quantum dot
Issue Date: 13-Mar-2002
Publisher: Elsevier
Citation: Applied Surface Science 188(1-2): 75-79 (2002)
Abstract: In segregation during InAs growth on (0 0 1)GaAs is studied by in situ stress measurements. From the accumulated stress evolution during deposition of 1 ML of In and the ulterior GaAs overgrowth, a limited In incorporation is observed (50%). The rest of In is floating or physisorbed on the surface, without contributing to stress through the formation of stable chemical bonds. During overgrowth with GaAs, the In is progressively incorporated as a graded InGaAs layer until total depletion of the floating In layer. This process, very different from Ga/In exchange at the growth front, is strongly temperature dependent for Tg>400 °C. The limited In incorporation gives a new perspective on the self-assembling of quantum dot as the low value for the critical thickness (<1 ML InAs) as well as their formation process.
Description: 5 páginas, 4 figuras.-- -- E-MRS Symposium M; Stress and Strain in Heteroepitaxy.
Publisher version (URL): http://dx.doi.org/10.1016/S0169-4332(01)00706-1
URI: http://hdl.handle.net/10261/32069
ISSN: 0169-4332
DOI: 10.1016/S0169-4332(01)00706-1
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