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Title: Thermochromic undoped and Mg-doped VO{sub 2} thin films and nanoparticles: Optical properties and performance limits for energy efficient windows

Undoped and Mg-doped thermochromic VO{sub 2} films with atom ratios z ≡ Mg/(Mg + V) of 0 ≤ z < 0.21 were deposited by reactive DC magnetron sputtering onto heated glass and carbon substrates. Elemental compositions were found by Rutherford backscattering spectrometry. Optical constants were determined from transmittance and reflectance measurements and were used for modeling the optical properties of thin films and dilute nanoparticle composite layers below and above the critical temperature for thermochromic switching between a low-temperature infrared transparent state and a high-temperature infrared reflecting or absorbing state. Mg-doped films showed superior luminous transmittance T{sub lum} and solar transmittance modulation ΔT{sub sol} compared to undoped VO{sub 2} films, and both of these parameters could be further enhanced by anti-reflection. VO{sub 2}-containing nanocomposites had much larger values of T{sub lum} and ΔT{sub sol} than VO{sub 2}-based films. Mg-doping was found to erode the properties of the nanocomposites. Approximate performance limits are given on T{sub lum} and ΔT{sub sol} for thermochromic VO{sub 2} films, with and without Mg doping and antireflection coating, and also for VO{sub 2}-containing dilute nanocomposites.
Authors:
; ;  [1]
  1. Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, P.O. Box 534, SE-75121 Uppsala (Sweden)
Publication Date:
OSTI Identifier:
22278138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMS; CARBON; COMPARATIVE EVALUATIONS; COMPOSITE MATERIALS; CRITICAL TEMPERATURE; DOPED MATERIALS; GLASS; MAGNESIUM COMPOUNDS; MODULATION; NANOSTRUCTURES; OPACITY; PERFORMANCE; RUTHERFORD BACKSCATTERING SPECTROSCOPY; SPECTRAL REFLECTANCE; SPUTTERING; SUBSTRATES; THIN FILMS; VANADIUM OXIDES