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

具有光谱选择性功能的高温稳定发射器是使用热光伏 (TPV) 系统将热辐射有效转换为电能的绝对条件。通常，光谱选择性发射器由多层材料或复杂制造工艺产生的几何结构组成。在这里，我们报告了一种基于 3D 介电柱几何结构上的钼 (Mo) 单金属层涂层的光谱选择性发射器。3D Mo 纳米柱使用大面积且具有成本效益的孔掩膜胶体光刻法制造。这些纳米结构的吸收率/发射率比 InGaAsSb PV 电池在 2.25 μm 处的截止波长低 95%，并且在近红外区域的吸收率/发射率急剧下降，接近 10% 的低发射率。3D Mo 纳米柱在 Ar 气氛下显示出高达 1473 K 的出色热/结构稳定性，持续时间为 24 小时，偏振和角度不变性高达 60° 入射角。凭借低成本和可扩展的制造方法，3D Mo 纳米结构在 TPV 和高温光子/等离子体应用中提供了巨大的机会。