Tailored specular reflectance properties of bulk Cu based novel intermetallic alloys

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Abstract

Significant research has been pursued to develop solar selective metallic coatings using a variety of coating deposition techniques, with limited attempts to assess the properties of bulk metallic materials for solar energy applications. In developing bulk solar reflectors with good reflectance in the entire solar range, we report a new class of reflector materials based on Cu-Sn intermetallics with tailored substitution of aluminium or zinc. Our experimental results suggest that the arc melted-suction cast Cu (78.8 at%)-Al (21.2 at%) alloy with nanoscale surface roughness can exhibit a combination of 89% bulk specular reflectance and 83% bulk solar reflectance, together with a hardness of 2 GPa. We show that the present alloy design approach paves the way for further opportunities of tuning the spectral properties of this new class of solar reflector material.

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Alex, S., Chattopadhyay, K., & Basu, B. (2016). Tailored specular reflectance properties of bulk Cu based novel intermetallic alloys. Solar Energy Materials and Solar Cells, 149, 66–74. https://doi.org/10.1016/j.solmat.2016.01.002

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