TiNxOy-Cu coatings for low-emissive solar-selective absorbers

Michel P. Lazarov; B. Roehle; Thomas Eisenhammer; R. Sizmann

doi:10.1117/12.49223

1 December 1991 TiN_xO_y-Cu coatings for low-emissive solar-selective absorbers

Michel P. Lazarov, B. Roehle, Thomas Eisenhammer, R. Sizmann

Proceedings Volume 1536, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion X; (1991) https://doi.org/10.1117/12.49223
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

TiNxOy films were deposited by activated reactive evaporation (ARE) on copper to produce a tandem solar absorber with a low emittance of 0.042 at 153 degree(s)C. The influence of oxygen and nitrogen partial pressures and the plasma current in the ARE-process were investigated. The optical selectivity of the absorber is determined mainly by the thickness and oxygen content of the coating. Increasing the oxygen partial pressure leads to higher oxygen content, lower emittance, and dielectric-like properties, i.e., small imaginary parts of the refractive index and small dispersion. Other preparation parameters are shown to have minor importance on the selective properties. The effective cut-off wavelength of the transition from high short wavelength absorptance to low long wavelength emittance can be shifted between 0.5 and 2 micrometers by changing either the thickness from 17 to 110 nm or the nitrogen to oxygen pressure ratio in the reactive gas from 1 to 200. The slope of the transition is affected by the pressure ratio.

Citation Download Citation

Michel P. Lazarov, B. Roehle, Thomas Eisenhammer, and R. Sizmann "TiN_xO_y-Cu coatings for low-emissive solar-selective absorbers", Proc. SPIE 1536, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion X, (1 December 1991); https://doi.org/10.1117/12.49223

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