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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4595

Title: Effect of InAlGaAs and GaAs Combination Barrier Thickness on the Duration of Dot Formation in Different Layers of Stacked InAs/GaAs Quantum Dot Heterostructure Grown by MBE
Authors: HALDER, N
SUSEENDRAN, J
CHAKRABARTI, S
HERRERA, M
BONDS, M
BROWNING, ND
Keywords: inas islands
spacer layer
strain
photoluminescence
emission
defects
shape
Issue Date: 2010
Publisher: AMER SCIENTIFIC PUBLISHERS
Citation: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 10(8), 5202-5206
Abstract: Multi layer stacks of quantum dots (QDs) (10 periods) with a combination barrier layer of In(0.21)Al(0.21)Ga(0.58)As (30 angstrom) and GaAs (70-180 angstrom) are grown by solid source molecular beam epitaxy (MBE) and reflection high-energy electron diffraction (RHEED) has been used for the in situ determination of the duration of dot formation in the QD layers. The increase in the duration of dot formation in the consecutive layers of the QD heterostructure with thinner barrier is attributed to the indium migration towards the defects in the strained QD layers. A thicker GaAs layer at 590 degrees C overgrown on the InAlGaAs is believed to remove the unevenness of the growth front for the subsequent QD layer resulting in good vertical stacking of islands till the final layer of the multilayer heterostructures.
URI: http://dx.doi.org/10.1166/jnn.2010.2380
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4595
http://hdl.handle.net/10054/4595
ISSN: 1533-4880
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