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We present an ab initio calculation to understand electronic structures andoptical properties of a tungsten carbide WC being a major component of aTiCN-based cermet. We found that the WC has a fairly low-energy plasmaexcitation $\sim$0.6 eV (2 $\mu$m) and therefore can be a good constituent of asolar selective absorber. The evaluated figure of merit for photothermalconversion is prominently high compared to those of the other materialsincluded in the TiCN-based cermet. The imaginary part of the dielectricfunction is considerably small around the zero point of the real part of thedielectric function, corresponding to the plasma excitation energy. Therefore,a clear plasma edge appeared, ensuring the high performance of the WC as thesolar absorber.

Ab initio calculation for electronic structure and optical property of tungsten carbide in a TiCN-based cermet for solar thermal applications