Abstract

Transparent heat-mirror films, which transmit solar radiation but reflect ir thermal radiation, have potentially important applications in solar/thermal/electric conversion, solar heating, solar photovoltaic conversion, and window insulation. We have used rf sputtering to prepare two types of films: TiO₂/Ag/TiO₂ and Sn-doped In₂O₃. To characterize the properties of heat-mirror films for solar-energy collection, we define the parameters α_eff, the effective solar absorptivity, and ∊_eff, the effective ir emissivity. For our Sn-doped In₂O₃ films, α_eff/∊_eff is comparable to the values of α/∊ reported for the leading selective absorbers. Even higher values of α_eff/∊_eff are obtained for the TiO₂/Ag/TiO₂ films.

© 1976 Optical Society of America

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