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Title: Effects of cation compositions on the electronic properties and optical dispersion of indium zinc tin oxide thin films by electron spectroscopy

Highlights: • REELS analysis can provide optical dispersion and electronic properties of oxide materials. • The band gap varied with In/Zn/Sn compositions and increased after annealing. • The optical properties were examined using REELS in conjunction with the Tougaard–Yubero model. • The dispersion parameters were determined by a single-oscillator Wemple–DiDomenico model. • The Zn and Sn contents play a crucial role in determining the single-oscillator constant and dispersion energy of IZTO thin films. - Abstract: The electronic properties and optical dispersion of indium zinc tin oxide (IZTO) films with different cation compositions were investigated by reflection electron energy loss spectroscopy (REELS). The REELS spectra of IZTO films revealed that the band gap varied with different Sn/Zn ratios and In content. The optical properties were examined with REELS data using Tougaard–Yubero model and the results were compared with the envelope of the transmission spectra obtained using a UV-spectrometer. The dispersion behavior of the refractive index from REELS results was studied in terms of the single-oscillator Wemple–DiDomenico model. The results showed that the different compositions of In/Zn/Sn caused a change in the dispersion parameters of IZTO thin films in contrast to the static values of refractive indices and dielectric constant which remainedmore » the same. Our work demonstrated that REELS is an efficient tool to study the optical properties of a material by obtaining the optical parameters.« less
Authors:
 [1] ;  [2] ; ;  [3] ;  [3] ; ; ;  [4] ;  [5]
  1. Department of Electrical Engineering, University of Sultan Ageng Tirtayasa, Banten 42435 (Indonesia)
  2. Division of Materials Science, Korea Basic Science Institute, Daejeon 305-806 (Korea, Republic of)
  3. Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)
  4. Analytical Engineering Center, Samsung Advanced Institute of Technology, Suwon 440-600 (Korea, Republic of)
  5. Department of Physics, Chemistry, and Pharmacy, University of Southern Denmark, DK-5230 Odense M. (Denmark)
Publication Date:
OSTI Identifier:
22420817
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 62; 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; ANNEALING; CATIONS; ENERGY-LOSS SPECTROSCOPY; INDIUM COMPOUNDS; OPTICAL DISPERSION; OSCILLATORS; PERMITTIVITY; REFLECTION; REFRACTIVE INDEX; SPUTTERING; THIN FILMS; TIN OXIDES; ZINC COMPOUNDS