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Spectrally Selective Solar Absorbers based on Ta:SiO2 Cermets for Next‐Generation Concentrated Solar–Thermal Applications
Energy Technology ( IF 3.8 ) Pub Date : 2020-05-15 , DOI: 10.1002/ente.202000125
Maryna Bilokur 1 , Angus Gentle 1 , Matthew D. Arnold 1 , Michael B. Cortie 1 , Geoffrey B. Smith 1
Affiliation  

An iterative algorithm is used to design a spectrally selective thin‐film stack to provide maximum solar‐to‐thermal conversion efficiency at the very high operating temperatures associated with high solar concentrations. The resulting stack is then fabricated by magnetron sputtering and characterized. It is composed of two Ta:SiO2 layers with differing Ta nanoparticle contents on a refractory metal substrate. A SiO2 antireflecting overlayer completes the stack. Optical and microstructural characterizations indicate that the stack achieves 97.6% solar absorptance up to 900 °C. Spectral selectivity and thermal stability improve on annealing in two ways, first, due to recrystallization of Pt or Ta back reflectors which lowers room temperature thermal emittance to 0.15 from 0.18, and to 0.14 from 0.21, respectively; and second, due to alloying of substrate atoms with the Ta nanoparticles of the cermet.

中文翻译:

基于Ta:SiO2金属陶瓷的光谱选择性太阳能吸收剂,用于下一代集中式太阳能热应用

迭代算法用于设计光谱选择性薄膜堆栈,以在与高太阳光浓度相关的非常高的工作温度下提供最大的太阳热转换效率。然后通过磁控溅射制造所得叠层并对其进行表征。它由两层具有不同Ta纳米颗粒含量的Ta:SiO 2层在耐火金属基材上组成。SiO 2防反射覆盖层可完成堆叠。光学和微观结构表征表明,该堆在高达900°C的温度下可获得97.6%的日吸收率。退火时,光谱选择性和热稳定性可以通过两种方式得到改善,首先是由于Pt或Ta背反射器的重结晶,使室温的热发射率从0.18降低到0.15,从0.21降低到0.14。第二,由于底物原子与金属陶瓷的Ta纳米粒子合金化。
更新日期:2020-07-02
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