Emissivity measurements of W/TiAlN/TiAlSiN/TiAlSiON/TiAlSiO -based multilayer spectrally selective absorbers at high temperature

•Total normal emissivity of solar absorber increased from 0.06 ± 0.01 (100 °C) to 0.22 ± 0.00 (600 °C)•Total hemispherical emissivity does not show a significant temperature dependence.•Spectral selectivity remained unchanged after emissivity measurements.•Structural and morphological stability showed potential for practical application.