High efficiency solar conversion requires collection of a broad spectrum of wavelengths from the ultra-violet into the infrared. Solar collector mirrors must provide high reflection across this spectral band without degrading over time. This work presents the results of a high-performance 200 mm parabolic mirror coated with an ultra-wide broadband dielectric reflector. The mirror was developed to demonstrate high efficiency broadband solar collection and power conversion. Mirror reflection was measured within the limits of NIST capabilities, and averaged over 99.65% from 400 to 1800 nm with an acceptance angle of 30°. Plasma-assisted reactive magnetron sputtering was used to produce these high density and environmentally stable films. These hard oxide films can be repeatedly cleaned in the field. Salt spray, humidity and angle performance results are presented.
Markus Fredell, Kirk Winchester, Gregg Jarvis, Sarah Locknar, Robert Johnson Jr., and Mark Keevers, "Ultra-wide broadband dielectric mirrors for solar collector applications," Proc. SPIE 10105, Oxide-based Materials and Devices VIII, 101051L (Presented at SPIE OPTO: February 01, 2017; Published: 24 February 2017); https://doi.org/10.1117/12.2250632.
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