CHEMICALLY DEPOSITED BI2S3-CUXS SOLAR CONTROL COATINGS

Solar control characteristics are described f or chemically deposited thin film coatings consisting of an initial layer of Bi2S3 film of approximately 0.05 mum thickness deposited at room temperature (25-degrees-C) for 45-75 min from baths containing bismuth nitrate, triethanolamine (TEA) and thioacetamide and a CuxS thin film of 0.1-0.25 mum thickness deposited either at room temperature, for 3-6 h, or at 50-degrees-C, for 1-2 h using baths consisting of copper(II) chloride, TEA, thioureau (TU), NaOH and NH3(aq). Air annealing of these films at 150-degrees-C for 30 min yield well-desired solar control characteristics: sheet resistance of 30-60 OMEGA/square which signifies a low thermal emittance; integrated transmittance of 15-32% in the visible region and 11-22% in the near-infrared region; integrated transmittance of approximately 13-25% for solar radiation and a range of shades in reflected daylight. Using a mathematical model, the solar control performance of these coatings in a 6 mm sheet glass is predicted for an architectural window in a tropical location showing that solar radiation rejection of approximately 50% is obtainable for a T(vis)* of 17%.