Clarke, E., Howe, P., Taylor, M. et al. (7 more authors) (2010) Persistent template effect in InAs/GaAs quantum dot bilayers. Journal of Applied Physics, 107 (11). 113502. ISSN 0021-8979
Abstract
The dependence of the optical properties of InAs/GaAs quantum dot(QD) bilayers on seed layer growth temperature and second layer InAs coverage is investigated. As the seed layer growth temperature is increased, a low density of large QDs is obtained. This results in a concomitant increase in dot size in the second layer, which extends their emission wavelength, reaching a saturation value of around 1400 nm at room temperature for GaAs-capped bilayers. Capping the second dot layer with InGaAs results in a further extension of the emission wavelength, to 1515 nm at room temperature with a narrow linewidth of 22 meV. Addition of more InAs to high density bilayers does not result in a significant extension of emission wavelength as most additional material migrates to coalesced InAs islands but, in contrast to single layers, a substantial population of regular QDs remains.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2010 American Institute of Physics. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | gallium arsenide; III-V semiconductors; indium compounds; molecular beam epitaxial growth; quantum dots; semiconductor growth; 1.3 MU-M; GAAS; STRAIN; EMISSION; ISLANDS; GROWTH; LASERS; SIZE |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 20 Apr 2016 13:32 |
Last Modified: | 20 Apr 2016 13:32 |
Published Version: | http://dx.doi.org/10.1063/1.3429226 |
Status: | Published |
Publisher: | American Institute of Physics |
Refereed: | Yes |
Identification Number: | 10.1063/1.3429226 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97413 |