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Growth and emission tuning of InAs/InP quantum dots superlattice

Zhuang, Qiandong and Yoon, S. F. and Zheng, H. Q. (2001) Growth and emission tuning of InAs/InP quantum dots superlattice. Journal of Crystal Growth, 227-22. pp. 1084-1088. ISSN 0022-0248

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Abstract

We report the solid source molecular beam epitaxial growth of InAs/InP quantum dot (QD) superlattices and the effect of As/P exchange on the interface between InAs and InP. The InAs QDs were found to have an average lateral diameter of ∼40 nm and a density of 3–4×109 cm−2. The QDs superlattice has photoluminescence (PL) emission centred at 0.77 eV with a linewidth of 64 meV at low temperature (4 K). X-ray diffraction (XRD) spectra showed evidence of significant As/P exchange on the interface between InAs and InP during in situ annealing under P2 pressure before growing the spacer layer of InP. An average P composition of ∼30% in the resulting InAsP QDs in samples annealed for 50 s was deduced from dynamical simulations of the experimental XRD spectra. The QDs superlattice PL emission exhibits a blueshift following an increase in annealing time, and emission at 1.55 μm and at 300 K was achieved. This observation holds promise for possible telecommunication device applications at long wavelengths.

Item Type: Article
Journal or Publication Title: Journal of Crystal Growth
Uncontrolled Keywords: Quantum dots; Superlattice; As/P exchange; PL emission
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 51491
Deposited By: ep_importer_pure
Deposited On: 16 Nov 2011 14:22
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51491

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