Abstract

Spectrally selective coatings have potentially important applications in solar-thermal-electric conversion, solar photovoltaic conversion, solar heating and window insulation. These coatings can be divided into two classes: transparent heat mirrors transmit solar radiation and reflect thermal radiation; selective absorbers absorb solar radiation and have a low IR emissivity. We prepared by r.f. sputtering cermet absorbers (MgO-Au and Cr 2O 3-Cr) and transparent heat mirror films (TiO 2/Ag/TiO 2, tin-doped In 2O 3 and tin-doped In 2O 3 microgrids) that have excellent wavelength-selective properties. We also recently succeeded in preparing excellent tin-doped In 2O 3 films on Mylar by ion beam sputtering. The tin-doped In 2O 3 films also have good electrical conductivities, making them excellent transparent conductors.

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