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23 February 1987 Thermochromic Materials Research for Optical Switching
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Reactive-ion-beam-sputtering (RIBS) is used to deposit doped vanadium dioxide (V1-xMxO2), where M is a dopant that lowers the transition temperature (Tt) from that of stoichiometric V02. The objective is to synthesize a material that will passively switch between a heat-transmitting-and a heat-reflecting-state at specific design temperatures in the human comfort range. The films are deposited at elevated temperature (>700K) onto glass and sapphire substrates for spectrophotometric evaluation above and below Tt. Then by analyzing the deposited films via EDAX, correlations between film composition and passive solar switching performance are made. Also concepts for synthesizing suitable crystallites of such materials are described. These crystallites could act as switchable pigments for throchromic solar paint. The overall long range goals of this research are to develop these materials for: (1) thin film application to building glazings and (2) pigments for opaque wall coatings. The glazings will transmit and the walls will absorb solar energy when the V1-xMxO2 temperature (T) is low (T<Tt). At T>Tt, both glazings and walls will reflect the solar infrared.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. C. Lee, G. V. Jorgenson, and R. J. Lin "Thermochromic Materials Research for Optical Switching", Proc. SPIE 0692, Materials and Optics for Solar Energy Conversion and Advanced Lightning Technology, (23 February 1987);

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