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Controlled and permanent induced Fermi shifts and upwards band bending in ZnO nanorods by surface stripping with argon bombardment / Chris Barnett, James McGettrick, Varun Gangoli, Jorge Navarro Torres, Trystan Watson, Thierry Maffeis, Andrew Barron, Alvin Orbaek White

Materials Letters, Volume: 301, Start page: 130288

Swansea University Authors: Chris Barnett, James McGettrick, Varun Gangoli, Jorge Navarro Torres, Trystan Watson, Thierry Maffeis, Andrew Barron, Alvin Orbaek White

  • Accepted Manuscript under embargo until: 21st June 2022

Abstract

Optimised ZnO nanorod characteristics are essential for novel devices to operate efficiently, especially shifting the n-type nature towards intrinsic or p-type. The effects of argon bombardment for varying amounts of time on the surface chemistry and Fermi level of ZnO nanorods have been studied usi...

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Published in: Materials Letters
ISSN: 0167-577X
Published: Elsevier BV 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57191
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Abstract: Optimised ZnO nanorod characteristics are essential for novel devices to operate efficiently, especially shifting the n-type nature towards intrinsic or p-type. The effects of argon bombardment for varying amounts of time on the surface chemistry and Fermi level of ZnO nanorods have been studied using XPS. Bombardment at 5 keV removed surface contamination caused by amorphous carbon and OH-, H2O and C-O groups. The bombardment also causes the O1s, Zn2p and valence band to shift to lower binding energies, indicating a shift towards intrinsic behaviour. Bombardment time can be used to effect a shift up to 0.8 eV, and this shift remains after the nanorods were re-contaminated by exposure to ambient conditions for 28 days. These results indicate that argon bombardment can permanently shift the n-type nature of ZnO to intrinsic for use in novel devices.
Keywords: ZnO, nanorod, argon bombardment, XPS, Fermi Shift
College: College of Engineering
Start Page: 130288