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Nonradiative step facets in semiconductor nanowires
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Sánchez, Ana M., Zhang, Yunyan, Tait, Edward W., Hine, Nicholas, Liu, Huiyun and Beanland, R. (2017) Nonradiative step facets in semiconductor nanowires. Nano Letters, 17 (4). pp. 2454-2459. doi:10.1021/acs.nanolett.7b00123 ISSN 1530-6984.
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WRAP-non-radiative-steps-nanowires-Sanchez-2017.pdf - Accepted Version - Requires a PDF viewer. Download (1449Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/acs.nanolett.7b00123
Abstract
One of the main advantages of nanowires for functional applications is their high perfection, which results from surface image forces that act on line defects such as dislocations, rendering them unstable and driving them out of the crystal. Here we show that there is a class of step facets that are stable in nanowires, with no long-range strain field or dislocation character. In zinc-blende semiconductors, they take the form of Σ3 (112) facets with heights constrained to be a multiple of three {111} monolayers. Density functional theory calculations show that they act as nonradiative recombination centers and have deleterious effects on nanowire properties. We present experimental observations of these defects on twin boundaries and twins that terminate inside GaAsP nanowires and find that they are indeed always multiples of three monolayers in height. Strategies to use the three-monolayer rule during growth to prevent their formation are discussed.
| Item Type: | Journal Article | ||||||||||||
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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 | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Semiconductors, Nanowires | ||||||||||||
| Journal or Publication Title: | Nano Letters | ||||||||||||
| Publisher: | American Chemical Society | ||||||||||||
| ISSN: | 1530-6984 | ||||||||||||
| Official Date: | 12 April 2017 | ||||||||||||
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| Volume: | 17 | ||||||||||||
| Number: | 4 | ||||||||||||
| Page Range: | pp. 2454-2459 | ||||||||||||
| DOI: | 10.1021/acs.nanolett.7b00123 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| Date of first compliant deposit: | 27 April 2017 | ||||||||||||
| Date of first compliant Open Access: | 24 March 2018 | ||||||||||||
| RIOXX Funder/Project Grant: |
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