Electro/EIectrolless Deposited Alloy Based Solar Selective Absorber Coatings

The chemical composition, morphology, selective absorber characteristics and degradation of selective absorber characteristics at high temperatures of black chrome solar selective coating are influenced by various substrate pre-treatments like mechanical polishing, chemical etching and electropolishing prior to film deposition. The major oxide content in the deposit is formed as Cu₂(OH) ₂CrO₄(JCPDS 38-0230), which on high temperature annealing decomposes to CuCrO₄(JCPDS 34-0507), CuO (JCPDS 41-0254) and Cu₂O (JCPDS 5-0667). Formation of the oxides of Cu at high temperatures retains the high optical absorption characteristics of the coating even after high temperature degradation.