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Title: Field emission properties of ZnO nanosheet arrays

Electron emission properties of electrodeposited ZnO nanosheet arrays grown on Indium tin oxide coated glass substrates have been studied. Influence of oxygen vacancies on electronic structures and field emission properties of ZnO nanosheets are investigated using density functional theory. The oxygen vacancies produce unshared d electrons which form an impurity energy state; this causes shifting of Fermi level towards the vacuum, and so the barrier energy for electron extraction reduces. The ZnO nanosheet arrays exhibit a low turn-on field of 2.4 V/μm at 0.1 μA/cm{sup 2} and current density of 50.1 μA/cm{sup 2} at an applied field of 6.4 V/μm with field enhancement factor, β = 5812 and good field emission current stability. The nanosheet arrays grown by a facile electrodeposition process have great potential as robust high performance vertical structure electron emitters for future flat panel displays and vacuum electronic device applications.
Authors:
;  [1] ; ;  [2] ; ;  [3] ;  [4]
  1. School of Basic Sciences, Indian Institute of Technology, Bhubaneswar 751013, Odisha (India)
  2. Center for Advanced Studies in Materials Science and Condensed Matter Physics, Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune - 411007 (India)
  3. Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, Maharashtra (India)
  4. SRM Research Institute, SRM University, Kattankulathur, Chennai 603 203, Tamil Nadu (India)
Publication Date:
OSTI Identifier:
22395490
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CURRENT DENSITY; DENSITY FUNCTIONAL METHOD; DIFFUSION BARRIERS; ELECTRODEPOSITION; ELECTRON EMISSION; ELECTRONIC STRUCTURE; ELECTRONS; FERMI LEVEL; FIELD EMISSION; INDIUM COMPOUNDS; NANOSTRUCTURES; OXYGEN; POTENTIALS; SHEETS; SUBSTRATES; TIN OXIDES; VACANCIES; ZINC OXIDES