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Thermally-driven formation method for growing (quantum) dots on sidewalls of self-catalysed thin nanowires
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Zhang, Yunyan, Fonseka, H. Aruni, Yang, Hui, Yu, Xuezhe, Jurczak, Pamela, Huo, Suguo, Sánchez, Ana M. and Liu, Huiyun (2022) Thermally-driven formation method for growing (quantum) dots on sidewalls of self-catalysed thin nanowires. Nanoscale Horizons, 7 (3). 311-318 . doi:10.1039/d1nh00638j ISSN 2055-6764.
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WRAP-Thermally-driven-growing-quantum-dots-sidewalls-self-catalysed-thin-nanowires-2022.pdf - Accepted Version - Requires a PDF viewer. Download (1120Kb) | Preview |
Official URL: https://doi.org/10.1039/d1nh00638j
Abstract
Embedding quantum dots (QDs) on nanowire (NW) sidewalls allows the integration of multi-layers of QDs into the active region of radial p–i–n junctions to greatly enhance light emission/absorption. However, the surface curvature makes the growth much more challenging compared with growths on thin-films, particularly on NWs with small diameters (Ø < 100 nm). Moreover, the {110} sidewall facets of self-catalyzed NWs favor two-dimensional growth, with the realization of three-dimensional Stranski–Krastanow growth becoming extremely challenging. Here, we have developed a novel thermally-driven QD growth method. The QD formation is driven by the system energy minimization when the pseudomorphic shell layer (made of QD material) is annealed under high-temperature, and thus without any restriction on the NW diameter or the participation of elastic strain. It has demonstrated that the lattice-matched Ge dots can be grown defect-freely in a controllable way on the sidewall facets of the thin (∼50 nm) self-catalyzed GaAs NWs without using any surfactant or surface treatment. This method opens a new avenue to integrate QDs on NWs, and can allow the formation of QDs in a wider range of materials systems where the growth by traditional mechanisms is not possible, with benefits for novel NWQD-based optoelectronic devices.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | Nanoscale Horizons | ||||||||
Publisher: | Royal Society of Chemistry (RSC) | ||||||||
ISSN: | 2055-6764 | ||||||||
Official Date: | 2022 | ||||||||
Dates: |
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Volume: | 7 | ||||||||
Number: | 3 | ||||||||
Page Range: | 311-318 | ||||||||
DOI: | 10.1039/d1nh00638j | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 25 April 2022 | ||||||||
Date of first compliant Open Access: | 4 February 2023 |
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