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Growth of self-organized InAs quantum dots on InP by solid-source molecular beam epitaxy

Zhuang, Qiandong and Yoon, S. F. and Zheng, H. Q. and Yuan, K. H. (2000) Growth of self-organized InAs quantum dots on InP by solid-source molecular beam epitaxy. Journal of Crystal Growth, 216 (1-4). pp. 57-61. ISSN 0022-0248

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Abstract

Self-organized InAs quantum dots (QDs) on InP (1 0 0) substrate have been prepared by solid-source molecular-beam epitaxy (SSMBE). Atomic force microscopy (AFM) examination shows that the InAs QDs possess low aspect ratio (1 : 17) of height vs. diameter. The low-temperature photoluminescence (PL) behavior of the QDs is characterized by a 65 meV PL linewidth at ∼0.8 eV, with three other emissions, which correspond to the various thicknesses of InAs wetting layers. It is deduced that the InAs wetting layers exceeded the intended InAs deposition, which is attributed to unintentional As/P exchange reaction. This excess material is further confirmed by XRD measurements, and indicates that effective exchange occurs even at low temperature (500°C) for SSMBE growth. No significant change in the QD emission peak is observed in the sample grown at high temperature, indicating the absence of any significant As/P exchange reaction in the QDs.

Item Type: Article
Journal or Publication Title: Journal of Crystal Growth
Uncontrolled Keywords: InAs/InP ; AFM ; Self-organized quantum dots ; SSMBE ; PL
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 51500
Deposited By: ep_importer_pure
Deposited On: 18 Nov 2011 11:47
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:23
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51500

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