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Title: The shift of optical band gap in W-doped ZnO with oxygen pressure and doping level

Highlights: • CVD–PLD co-deposition technique was used. • Better crystalline of the ZnO samples causes the redshift of the optical band gap. • Higher W concentration induces blueshift of the optical band gap. - Abstract: Tungsten-doped (W-doped) zinc oxide (ZnO) nanostructures were synthesized on quartz substrates by pulsed laser and hot filament chemical vapor co-deposition technique under different oxygen pressures and doping levels. We studied in detail the morphological, structural and optical properties of W-doped ZnO by SEM, XPS, Raman scattering, and optical transmission spectra. A close correlation among the oxygen pressure, morphology, W concentrations and the variation of band gaps were investigated. XPS and Raman measurements show that the sample grown under the oxygen pressure of 2.7 Pa has the maximum tungsten concentration and best crystalline structure, which induces the redshift of the optical band gap. The effect of W concentration on the change of morphology and shift of optical band gap was also studied for the samples grown under the fixed oxygen pressure of 2.7 Pa.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [1]
  1. Department of Physics, University of Puerto Rico, San Juan, PR 00936-8377 (Puerto Rico)
  2. (China)
Publication Date:
OSTI Identifier:
22348660
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 54; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL VAPOR DEPOSITION; DOPED MATERIALS; ENERGY BEAM DEPOSITION; LASER RADIATION; NANOSTRUCTURES; OPTICAL PROPERTIES; OXYGEN; PULSES; RAMAN EFFECT; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SPECTRA; SUBSTRATES; TUNGSTEN; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC OXIDES