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Thermochromic VO2 Films with Enhanced Luminous Transparency and Solar Modulation

Nuru R. Mlyuka 1,2Gunnar A. Niklasson 1Claes Granqvist 1

1. Uppsala University, Department of Engineering Sciences, The Angstrom Laboratory, Uppsala SE-75121, Sweden
2. University of Dar es Salaam, Physics Department, Dar es Salaam 35063, Tanzania

Abstract

Vanadium dioxide (VO2) shows an abrupt change in optical and electrical properties when its temperature is raised beyond a critical point of ~68 oC. Films made from such materials have a potential to be used in smart windows with dynamic throughput of solar radiation. Two of the drawbacks of this material have been its low luminous transmittance and small solar transmittance modulation during switching. In this work we report calculations and experiments on multilayers of VO2 and TiO2 films, produced by reactive magnetron sputtering, that significantly improve the luminous transmittance and solar modulation of the films during switching.

 

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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium C, by Nuru R. Mlyuka
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-09 11:53
Revised:   2009-06-07 00:48