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Bismuth incorporation and the role of ordering in GaAsBi/GaAs structures
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Reyes, Daniel F., Bastiman, Faebian, Hunter, Chris J., Sales, David L., Sánchez, Ana M., David, John P. R. and González Robledo, David (2014) Bismuth incorporation and the role of ordering in GaAsBi/GaAs structures. Nanoscale Research Letters, Volume 9 . Article number 23. doi:10.1186/1556-276X-9-23 ISSN 1556-276X.
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Official URL: http://dx.doi.org/10.1186/1556-276X-9-23
Abstract
The structure and composition of single GaAsBi/GaAs epilayers grown by molecular beam epitaxy were investigated by optical and transmission electron microscopy techniques. Firstly, the GaAsBi layers exhibit two distinct regions and a varying Bi composition profile in the growth direction. In the lower (25 nm) region, the Bi content decays exponentially from an initial maximum value, while the upper region comprises an almost constant Bi content until the end of the layer. Secondly, despite the relatively low Bi content, CuPtB-type ordering was observed both in electron diffraction patterns and in fast Fourier transform reconstructions from high-resolution transmission electron microscopy images. The estimation of the long-range ordering parameter and the development of ordering maps by using geometrical phase algorithms indicate a direct connection between the solubility of Bi and the amount of ordering. The occurrence of both phase separation and atomic ordering has a significant effect on the optical properties of these layers.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Molecular beam epitaxy, Bismuth, Microscopy | ||||
Journal or Publication Title: | Nanoscale Research Letters | ||||
Publisher: | Springer | ||||
ISSN: | 1556-276X | ||||
Official Date: | January 2014 | ||||
Dates: |
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Volume: | Volume 9 | ||||
Page Range: | Article number 23 | ||||
DOI: | 10.1186/1556-276X-9-23 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Date of first compliant deposit: | 26 December 2015 | ||||
Date of first compliant Open Access: | 26 December 2015 | ||||
Funder: | Spain. Ministerio de Ciencia e Innovación (MICINN), Andalusia (Spain), European Union (EU) | ||||
Grant number: | MAT2010-15206, TEC2011-29120-C05-03 (MICINN) ; P09-TEP-5403 (JA) ; MP0805 (EU) |
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