The spectrally selective properties of chemically-deposited Ag 2S on aluminium

Abstract

Silver sulfide coatings were chemically deposited on aluminium substrates using spray pyrolysis techniques. These techniques were used for the first time to prepare Ag 2S. Various combinations of the spraying solution were controlled to give higher solar selectivity. Absorptance and emittance measurements were made to discern the spectral selectivity for their application in photothermal conversion. The structure of the Ag 2S coatings was characterized by X-ray diffraction. The coatings are stable and have good adhesive properties. The costs of one square meter of Ag 2S layer is approximately US$ 1.0.