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Spectrally selective solar absorbers

  • US 4,098,956 A
  • Filed: 08/11/1976
  • Issued: 07/04/1978
  • Est. Priority Date: 08/11/1976
  • Status: Expired due to Term
First Claim
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1. An absorber stack consisting of a substrate having coated thereon a reflective metal film and having a solar energy absorptive film superposed upon said reflective metal film;

  • said reflective metal film having a thickness of about 1500 Angstroms and consisting of a metal selected from the group consisting of gold, copper, silver, aluminum, beryllium, molybdenum and tungsten, and said absorptive film having a thickness of about 800 to 2400 Angstroms and consisting of a compound of the formula MCx Oy Nz wherein M is selected from the group consisting of titanium, zirconium and hafnium and mixtures thereof and wherein the sum of x+y+z is greater than 0 but less than 2.

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