Tailoring the emission spectra of a thermophotovoltaic (TPV) emitter away from that of a blackbody has the potential to minimize transmission and thermalization loss in a photovoltaic receiver. Selective TPV emitters can lead to solar energy conversion with efficiency greater than the Shockley–Queisser limit and can facilitate the generation of useful energy from waste heat. A new design is introduced to radically tune thermal emission that leverages the interplay between two resonant phenomena in simple planar nanostructures—absorption in weakly absorbing nanofilms and reflection in multilayer dielectric stacks. A virtual screening approach is employed to identify promising structures for a selective thermal emitter from a search space of millions, several of which approach the ideal values of a step‐function selective thermal emitter. One of these structures is experimentally fabricated and evaluated, which includes a weakly absorbing alloy with tailored optical properties fabricated by atomic layer deposition (ALD). The versatility of the design and fabrication approach result in an emitter with excellent spectral density (0.8 W cm⁻² sr⁻¹) and spectral efficiency (46.8%) at 1373 K. Future experimental challenges to a more accurate realization of the optimal structures calculated are also considered.

中文翻译：

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通过弱吸收器临界耦合的热光伏帕累托最优光谱选择发射极

使热光电（TPV）发射器的发射光谱远离黑体，可以将光伏接收器中的透射和热损失降至最低。选择性TPV发射器可以导致太阳能转换，其效率高于Shockley-Queisser极限，并且可以促进从废热中产生有用的能量。引入了一种新的设计，可以从根本上调节热辐射，从而利用简单平面纳米结构中两个共振现象之间的相互作用-弱吸收纳米膜中的吸收和多层电介质叠层中的反射。虚拟筛选方法用于从数百万个搜索空间中确定选择性热辐射器的有希望的结构，其中一些接近步进功能选择性热辐射器的理想值。这些结构之一是通过实验制造和评估的，其中包括一种具有弱吸收性的合金，该合金具有通过原子层沉积（ALD）制造的量身定制的光学性能。设计和制造方法的多功能性使发射器具有出色的光谱密度（0.8 W cm^-2 sr ^-1）和在1373 K处的光谱效率（46.8％）。还考虑了未来实验挑战，要求更精确地实现所计算的最佳结构。