Abstract
The solar selective properties of copper oxide/stainless steel tandems have been investigated. Copper films were deposited by sputtering and electrolysis onto sputtered and bulk ferritic stainless steel films. The Cu 2O and CuO oxides were obtained by thermal oxidation at 170 and 350°C, respectively. Chlorite-oxidation is not feasible for thin copper films on steel. The reflectance spectra for the two oxides obtained from sputtered copper films agreed well with calculated values. In the calculations the optical constants for free oxide films and bulk stainless steel were used. The CuO-oxide gives higher solar absorption than Cu 2O because of the smaller bandgap and the electrolytic deposition of copper gives a texture-enhanced absorption in comparison with the calculated values. The solar absorption was further enhanced by MgF 2 antireflection-coating. The thermal stability of the tandem CuO/steel was found to be superior to the corresponding copper based tandem and the Cu 2O/steel improved by continued oxidation at 170°C.
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