Growth process, characterization, and modeling of electronic properties of coupled InAsSbP nanostructures

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2011
Authors
Marquardt, Oliver
Hickel, Tilmann
Neugebauer, Joerg
Gambaryan, Karen M.
Aroutiounian, Vladimir M.
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AIP Publishing
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Abstract
Quaternary III-V InAsSbP quantum dots (QDs) have been grown in the form of cooperative InAsSb/InAsP structures using a modified version of the liquid phase epitaxy. High resolution scanning electron microscopy, atomic force microscopy, and Fourier-transform infrared spectrometry were used to investigate these so-called nano-camomiles, mainly consisting of a central InAsSb QD surrounded by six InAsP-QDs, that shall be referred to as leaves in the following. The observed QDs average density ranges from 0.8 to 2 x 10(9) cm(-2), with heights and widths dimensions from 2 to 20 nm and 5 to 45 nm, respectively. The average density of the leaves is equal to (6-10) x 10(9) cm(-2) with dimensions of approx. 5 to 40 nm in width and depth. To achieve a first basic understanding of the electronic properties, we have modeled these novel nanostructures using second-order continuum elasticity theory and an eight-band k . p model to calculate the electronic structure. Our calculations found a clear localization of hole states in the central InAsSb dot. The localization of electron states, however, was found to be weak and might thus be easily influenced by external electric fields or strain. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3624621]
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III-V semiconductors , Quantum dots , Nanostructures , Elasticity , Band gap
Citation
Marquardt, O., Hickel, T., Neugebauer, J., Gambaryan, K. M. and Aroutiounian, V. M. (2011) 'Growth process, characterization, and modeling of electronic properties of coupled InAsSbP nanostructures', Journal of Applied Physics, 110(4), 043708 (6pp). doi: 10.1063/1.3624621
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© 2011, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Marquardt, O., Hickel, T., Neugebauer, J., Gambaryan, K. M. and Aroutiounian, V. M. (2011) 'Growth process, characterization, and modeling of electronic properties of coupled InAsSbP nanostructures', Journal of Applied Physics, 110(4), 043708 (6pp). doi: 10.1063/1.3624621 and may be found at http://aip.scitation.org/doi/10.1063/1.3624621