Abstract
Efforts have been made to improve the selective performance of a cobalt oxide absorber by providing it with an optimized transparent and i.r. reflective shield of indium-tin-oxide. For optimal selectivity of the spray-pyrolysed indium-tin-oxide coating, it has been observed that, besides a dopant (tin) concentration of 8.0 mol% in the indium oxide layer, a growth temperature of 500–550°C and a minimum layer thickness of 0.3 μm is favourable. Applying this coating on the cobalt oxide absorber gives a better spectral-selective surface for intermediate-temperature solar collectors, with a solar absorptance of 0.90 and thermal emittance of 0.12–0.13.
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