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Fermi-level pinning can determine polarity in semiconductor nanorods
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Avraam, Philip W., Hine, Nicholas, Tangney, Paul and Haynes, Peter D. (2012) Fermi-level pinning can determine polarity in semiconductor nanorods. Physical Review B (Condensed Matter and Materials Physics), 85 (11). pp. 1-9. 115404 . doi:10.1103/PhysRevB.85.115404 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.85.115404
Abstract
First-principles calculations of polar semiconductor nanorods reveal that their dipole moments are strongly influenced by Fermi-level pinning. The Fermi level for an isolated nanorod is found to coincide with a significant density of electronic surface states at the end surfaces, which are either mid-gap states or band-edge states. These states pin the Fermi level, and therefore fix the potential difference across the rod. We provide evidence that this effect can have a determining influence on the polarity of nanorods, with consequences for the way a rod responds to changes in its surface chemistry, the scaling of its dipole moment with its size, and the dependence of polarity on its composition.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Semiconductor nanoparticles | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | 85 | ||||
Number: | 11 | ||||
Number of Pages: | 9 | ||||
Page Range: | pp. 1-9 | ||||
Article Number: | 115404 | ||||
DOI: | 10.1103/PhysRevB.85.115404 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 30 March 2016 | ||||
Date of first compliant Open Access: | 5 April 2016 | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), European Commission (EC), Royal Society (Great Britain) | ||||
Grant number: | EP/G05567X/1 (EPSRC), CT-2007- 208858 (EC) |
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