Abstract
Efficient photothermal solar converters exhibit high solar absorptance and low thermal emittance. The spectral selectivity of both tin oxide (SnO 2) and black molybdenum (BlMo) has been demonstrated in the literature. Tin oxide is transparent in the visible yet becomes reflective in the infrared. Black molybdenum is absorptive in the visible while exhibiting only moderate infrared reflectance, if post-deposition annealing is avoided. Coating BlMo with SnO 2 increases absorptance due to antireflection in the visible and decreases emittance due to the higher infrared reflectance of SnO 2. Typical SnO 2 BlMo stacks exhibit an absorptance of 91 % (of the air mass 2 solar input) and a normal emittance of 13 % (of the 200 C blackbody curve). Both layers are produced under one atmosphere at temperatures as high as 500 C. Exposure of the stacks to air at 400 C for over 48 hours has resulted in no observable optical changes.
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