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Structural and opti...
Structural and optical characterization of Mg-doped GaAs nanowires grown on GaAs and Si substrates
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Falcao, B. P. (author)
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Leitao, J. P. (author)
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Correia, M. R. (author)
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Soares, M. R. (author)
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Morales, F. M. (author)
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Manuel, J. M. (author)
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Garcia, R. (author)
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- Gustafsson, Anders (author)
- Lund University,Lunds universitet,Fasta tillståndets fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Solid State Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Moreira, M. V. B. (author)
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de Oliveira, A. G. (author)
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Gonzalez, J. C. (author)
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(creator_code:org_t)
- AIP Publishing, 2013
- 2013
- English.
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In: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 114:18
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http://dx.doi.org/10...
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Abstract
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- We report an investigation on the morphological, structural, and optical properties of large size wurtzite GaAs nanowires, low doped with Mg, grown on GaAs(111) B and Si(111) substrates. A higher density of vertical nanowires was observed when grown upon GaAs(111) B. Very thin zinc-blende segments are observed along the axis of the nanowires with a slightly higher linear density being found on the nanowires grown on Si(111). Low temperature cathodoluminescence and photoluminescence measurements reveal an emission in the range 1.40-1.52 eV related with the spatial localization of the charge carriers at the interfaces of the two crystalline phases. Mg related emission is evidenced by cathodoluminescence performed on the GaAs epilayer. However, no direct evidence for a Mg related emission is found for the nanowires. The excitation power dependency on both peak energy and intensity of the photoluminescence gives a clear evidence for the type II nature of the radiative transitions. From the temperature dependence on the photoluminescence intensity, non-radiative de-excitation channels with different activation energies were found. The fact that the estimated energies for the escape of the electron are higher in the nanowires grown on Si(111) suggests the presence of wider zinc-blende segments. (C) 2013 AIP Publishing LLC.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Falcao, B. P.
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Leitao, J. P.
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Correia, M. R.
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Soares, M. R.
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Morales, F. M.
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Manuel, J. M.
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show more...
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Garcia, R.
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Gustafsson, Ande ...
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Moreira, M. V. B ...
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de Oliveira, A. ...
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Gonzalez, J. C.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Applied Physics ...
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Journal of Appli ...
- By the university
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Lund University