InAs quantum dots at telecommunication wavelengths are desired as single-photon sources, but a growth technique that enables wide control over quantum dot size, density, and morphology is needed. Droplet epitaxy is well suited for this purpose, but InAs nanostructures tend to form as rings on (001) InGaAs, InAlAs, and InP surfaces. In this work, we investigate how surface diffusion can be manipulated to grow quantum dots by molecular beam epitaxy without using high-index substrates or metamorphic buffers. First, surface diffusion characteristics of In on In0.52Al0.48As are compared to In and Ga on In0.53Ga0.47As. Then, a two-step arsenic exposure protocol is applied to modify the droplet crystallization step, resulting in a series of different nanostructure morphologies that have narrow-linewidth emission between 1200 and 1520 nm at 4 K. Ultimately, we show that controlling surface diffusion of the group-III species during growth is critical for achieving quantum dots appropriate for single-photon sources at telecommunication wavelengths.
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Research Article|
April 10 2023
InAs quantum emitters at telecommunication wavelengths grown by droplet epitaxy
Margaret A. Stevens
;
Margaret A. Stevens
a)
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Visualization, Writing – original draft)
1
U.S. Naval Research Laboratory
, 4555 Overlook Avenue SW, Washington, DC 20375a)Author to whom correspondence should be addressed: margaret.stevens@nrl.navy.mil
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Wayne McKenzie
;
Wayne McKenzie
(Conceptualization, Formal analysis, Investigation, Methodology, Project administration, Writing – review & editing)
2
Laboratory for Telecommunication Sciences
, 8080 Greenmead Drive, College Park, Maryland 20740
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Gerald Baumgartner
;
Gerald Baumgartner
(Conceptualization, Supervision, Writing – review & editing)
2
Laboratory for Telecommunication Sciences
, 8080 Greenmead Drive, College Park, Maryland 20740
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Joel Q. Grim
;
Joel Q. Grim
(Conceptualization, Supervision, Writing – review & editing)
1
U.S. Naval Research Laboratory
, 4555 Overlook Avenue SW, Washington, DC 20375
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Samuel G. Carter
;
Samuel G. Carter
(Supervision, Writing – review & editing)
3
Laboratory for Physical Sciences
, 8050 Greenmead Drive, College Park, Maryland 20740
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Allan S. Bracker
Allan S. Bracker
(Conceptualization, Funding acquisition, Resources, Supervision, Writing – review & editing)
1
U.S. Naval Research Laboratory
, 4555 Overlook Avenue SW, Washington, DC 20375
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a)Author to whom correspondence should be addressed: margaret.stevens@nrl.navy.mil
Note: This paper is a part of the Special Topic Collection: Papers from the 36th North American Conference on Molecular Beam Epitaxy (NAMBE 2022).
J. Vac. Sci. Technol. A 41, 032703 (2023)
Article history
Received:
February 09 2023
Accepted:
March 24 2023
Citation
Margaret A. Stevens, Wayne McKenzie, Gerald Baumgartner, Joel Q. Grim, Samuel G. Carter, Allan S. Bracker; InAs quantum emitters at telecommunication wavelengths grown by droplet epitaxy. J. Vac. Sci. Technol. A 12 May 2023; 41 (3): 032703. https://doi.org/10.1116/6.0002572
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