To be clear - selective solar absorbers that absorb the solar spectrum well and have low infrared emissivity (so they don't radiate heat well), are a mature con

To be clear - selective solar absorbers that absorb the solar spectrum well and have low infrared emissivity (so they don't radiate heat well), are a mature concept and can be achieved by multilayer coatings pretty well. This is a nice manufacturing process and could also be a competitive approach compared to conventional thin film deposition. However, I don't think the specific performance is dramatically different from things that are used in commercial solar thermal systems.