Abstract
We propose a novel heterostructure based on 2D photonic crystals as broadband selective absorbers/emitters for solar thermophotovoltaics. Alternating hafnium oxide () and titanium oxide () filled cylinder cavities with tetragonal lattices are embedded into antireflection-coated tungsten () film. The simulated results show that the designed structures can obtain high solar collection efficiency of 87.9% as an absorber and great spectral emission efficiency of 81.6% as an emitter. Meanwhile, high average absorptivity of 84.5% under 45° oblique incidence exhibits good performance of wide-angle absorption. This study provides a new way to acquire broadband spectral selective absorbers/emitters.
© 2018 Optical Society of America
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