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Engineering the morphology and optical properties of InP-based InAsSb/InGaAs nanostructures via Sb exposure and graded growth techniques

Published online by Cambridge University Press:  18 March 2013

W. Lei ,
H.H. Tan  and
C. Jagadish
W. Lei
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Crawley 6009, WA, Australia
H.H. Tan
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
C. Jagadish
Affiliation:
Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
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Abstract

Two growth techniques - antimony exposure and graded growth, were proposed to achieve the control over the morphology and optical properties of self-assembled InAsSb/InGaAs/InP nanostructures. By exposing the surface of InGaAs buffer layer to trimethylantimony precursor before the growth of InAsSb nanostructures, the surface/interface energy in the system is reduced, while the strain energy in the system is enhanced. This leads to a change of island shape from dot structure to wire structure. By using a higher initial mole fraction of trimethylantimony precursor during the graded growth of InAsSb, more Sb can be incorporated into the InAsSb islands despite the same Sb mole fraction averaged over the graded growth. This also results in a shape change from dot to wire structure. As a result of their shape change, photoluminescence from the InAsSb nanostructures shows different polarization characteristics.

Keywords

epitaxynanostructureoptoelectronic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1509: Symposium CC – Optically Active Nanostructures , 2013 , mrsf12-1509-cc05-09
Copyright
Copyright © Materials Research Society 2013

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