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Title: Bandgap widening in thermochromic Mg-doped VO{sub 2} thin films: Quantitative data based on optical absorption

Thermochromic Mg-doped VO{sub 2} films were deposited by reactive direct current magnetron sputtering onto heated glass and carbon substrates. Elemental compositions were inferred from Rutherford backscattering. Optical bandgaps were obtained from spectral transmittance and reflectance measurements—from both the film side and the back side of the samples—and ensuing determination of absorption coefficients. The bandgap of Mg-doped films was found to increase by 3.9 ± 0.5 eV per unit of atom ratio Mg/(Mg + V) for 0 < Mg/(Mg + V) < 0.21. The presence of ∼0.45 at. % Si enhanced the bandgap even more.
Authors:
; ;  [1] ;  [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, P.O. Box 534, SE-75121 Uppsala (Sweden)
  2. (Tanzania, United Republic of)
  3. Department of Physics and Astronomy, The Ångström Laboratory, Uppsala University, P.O. Box 516, SE-75120 Uppsala (Sweden)
  4. KTH-ICT, Royal Institute of Technology, Electrum 229, SE-164 40 Kista-Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22217903
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 16; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ATOMS; CARBON; DEPOSITION; DIRECT CURRENT; DOPED MATERIALS; ENERGY GAP; GLASS; INFRARED SPECTRA; MAGNESIUM; MAGNETRONS; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SPUTTERING; SUBSTRATES; THIN FILMS; ULTRAVIOLET SPECTRA; VANADIUM OXIDES; VISIBLE SPECTRA