Self-assembly of (111)-oriented tensile-strained quantum dots by molecular beam epitaxy

Schuck, Christopher F., McCown, Robin A., Hush, Ashlie, Mello, Austin, Roy, Simon, Spinuzzi, Joseph W., Liang, Baolai, Huffaker, Diana L. ORCID: https://orcid.org/0000-0001-5946-4481 and Simmonds, Paul J. 2018. Self-assembly of (111)-oriented tensile-strained quantum dots by molecular beam epitaxy. Journal of Vacuum Science and Technology B 36 (3) , 031803. 10.1116/1.5018002

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Abstract

The authors report on a comprehensive study of the growth of coherently strained GaAs quantum dots (QDs) on (111) surfaces via the Stranski–Krastanov (SK) self-assembly mechanism. Recent reports indicate that the long-standing challenges, whereby the SK growth mechanism could not be used to synthesize QDs on (111) surfaces, or QDs under tensile strain, have been overcome. However, a systematic study of the SK growth of (111)-oriented, tensile-strained QDs (TSQDs) as a function of molecular beam epitaxy growth parameters is still needed. Here, the authors explore the effects of deposition amount, substrate temperature, growth rate, and V/III flux ratio on the SK-driven self-assembly of GaAs(111)A TSQDs. The authors highlight aspects of TSQD SK self-assembly on (111) surfaces that appear to differ from the SK growth of traditional compressively strained QDs on (100) surfaces. The unique properties of (111) QDs and tensile-strained QDs mean that they are of interest for various research areas. The results discussed here offer a practical guide for tailoring the size, shape, density, uniformity, and photon emission wavelength and intensity of (111) TSQDs for future applications.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	AIP Publishing
ISSN:	2166-2746
Date of First Compliant Deposit:	4 April 2018
Date of Acceptance:	12 March 2018
Last Modified:	08 May 2023 02:26
URI:	https://orca.cardiff.ac.uk/id/eprint/110503

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