Spectrally selective emitters based on 3D Mo nanopillars for thermophotovoltaic energy harvesting

High-temperature stable emitters with spectral selective functionality are an absolute condition for efficient conversion of thermal radiation into electricity using thermophotovoltaic (TPV) systems. Usually, made up multilayered materials or geometrical structures resulting from complex fabrication processes. Here, we report a spectrally emitter based on single metal layer coating molybdenum (Mo) over 3D dielectric pillar geometry. Mo nanopillars fabricated large-area and cost-effective hole-mask colloidal lithography. These nanostructures show absorptivity/emissivity 95% below the cut-off wavelength InGaAsSb PV cell at 2.25 ?m, sharp decline in near-infrared regions, approaching low emissivity 10%. The outstanding thermal/structural stability to 1473 K 24 h duration under Ar atmosphere polarization angle invariance 60° incidence angles. With low-cost scalable method, provide tremendous opportunities TPV high temperature photonic/plasmonic applications.