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The selectivity of an interference controlled oxide/metal solar absorber is considered. It is argued that for high solar absorption it is important to have a low interference maximum as well as minimum. The reflectance of a double layer is calculated within the conventional interference formalism assuming homogenous layers and sharp boundaries. With the use of some simplifications the value of the interference maximum is derived corresponding to an interference minimum at 0.8 μm. The results are presented as interference maximum iso-reflectance contours in the nk-plane for the oxide. It is found that lower metal reflectance gives lower Rmax-values and that the oxide should have low n-values with an k/n-ratio -0.4. In a few cases the predictions are compared with experiments and the special case of Ir02/steel is commented upon.
Carl G. Ribbing andBjorn Karlsson
"Optical Conditions On Oxides For Tandem Solar Absorbers", Proc. SPIE 0502, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion III, (2 November 1984); https://doi.org/10.1117/12.944789
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Carl G. Ribbing, Bjorn Karlsson, "Optical Conditions On Oxides For Tandem Solar Absorbers," Proc. SPIE 0502, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion III, (2 November 1984); https://doi.org/10.1117/12.944789