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Data for Defect dynamics in self-catalyzed III-V semiconductor nanowires
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Gott, James A., Beanland, Richard, Fonseka, H. Aruni, Peters, Jonathan J. P., Zhang, Yunyan, Liu, Huiyun and Sánchez, Ana M. (2019) Data for Defect dynamics in self-catalyzed III-V semiconductor nanowires. [Dataset]
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Official URL: http://wrap.warwick.ac.uk/118701
Abstract
The droplet consumption step in self-catalyzed III-V semiconductor nanowires can produce material that contains a high density of line defects. Interestingly, these defects are often associated with twin boundaries and have null Burgers vector, i.e. no long-range strain field. Here we analyze their stability by considering the forces that act on them and use in-situ aberration corrected scanning transmission electron microscopy (STEM) to observe their behavior in GaAsP NWs using short annealing cycles. Their movement appears to be consistent with the thermally-activated single- or double-kink mechanisms of dislocation glide, with velocities that do not exceed 1 nm s-1. We find that motion of individual defects depends on their size, position, and surrounding environment and set an upper limit to activation energy around 2eV. The majority of defects (>70%) are removed by our post-growth annealing for several seconds at temperatures in excess of 640 °C, suggesting that in-situ annealing during growth at lower temperatures would significantly improve material quality. The remaining defects do not move at all and are thermodynamically stable in the nanowire.
Item Type: | Dataset | |||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Type of Data: | Electron microscope images and data | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Nanowires, Compound semiconductors, Semiconductors -- Defects, Nanotechnology | |||||||||||||||
Publisher: | University of Warwick, Department of Physics | |||||||||||||||
Official Date: | 25 July 2019 | |||||||||||||||
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Status: | Not Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Media of Output (format): | .dm4, .txt; .xlsx, png; .tiff; .mp4, .avi | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Copyright Holders: | University of Warwick | |||||||||||||||
Description: | Electron microscope images and data in formats .dm4, .xlsx, .tif, .png, .avi and .mp4. Filenames as follows are individually available for download: 1a.dm4: ADF STEM image of a nanowire with defective tip. |
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Date of first compliant deposit: | 31 July 2019 | |||||||||||||||
Date of first compliant Open Access: | 31 July 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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