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Data for Stable defects in semiconductor nanowires

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Sánchez, Ana M. and Beanland, R. (2018) Data for Stable defects in semiconductor nanowires. [Dataset] (Unpublished)

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Abstract

Semiconductor nanowires are commonly described as being defect-free due to their ability to expel mobile defects with long range strain fields. Here, we describe previously undiscovered topologically protected line defects with null Burgers vector that, unlike dislocations, are stable in nanoscale crystals. We analyze the defects present in semiconductor nanowires in regions of imperfect crystal growth, i.e., at the nanowire tip formed during consumption of the droplet in self-catalyzed vapor−liquid−solid growth and subsequent vapor−solid shell growth. We use a form of the Burgers circuit method that can be applied to multiply twinned material without difficulty. Our observations show that the nanowire microstructure is very different from bulk material, with line defects either (a) trapped by locks or other defects, (b) arranged as dipoles or groups with a zero total Burgers vector, or (c) have a zero Burgers vector. We find two new line defects with a null Burgers vector, formed from the combination of partial dislocations in twinned material. The most common defect is the three-monolayer high twin facet with a zero Burgers vector. Studies of individual nanowires using cathodoluminescence show that optical emission is quenched in defective regions, showing that they act as strong nonradiative recombination centers.

Item Type: Dataset
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Physics
Type of Data: Electron microscope images
Library of Congress Subject Headings (LCSH): Semiconductors, Nanowires
Publisher: Department of Physics, University of Warwick
Official Date: 18 April 2018
Dates:
DateEvent
6 April 2018Available
18 April 2018Published
Status: Not Peer Reviewed
Publication Status: Unpublished
Media of Output: .dm4
Description:

Electron microscope images and image stacks, stored in a proprietary format by Digital Micrograph (Gatan Inc.) as .DM4 files.

RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/P000916/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P000886/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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Contributors:
ContributionNameContributor ID
DepositorSanchez, Ana M.30156

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