High efficiency rare-earth emitter for thermophotovoltaic applications
High efficiency rare-earth emitter for thermophotovoltaic applications
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DOI：
10.1063/1.4895932
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发表时间：
2014-09-15
影响因子：
4
通讯作者：
Bermel, P.
中科院分区：
文献类型：
--
作者：
Sakr, E. S.;Zhou, Z.;Bermel, P.
在这项工作中，我们提出了一种基于稀土的陶瓷热发射器设计，可以在1573K（1300摄氏度）的温度下显着提高热光伏（TPV）效率，而无需冷侧过滤器。所提出的发射器增强了自然发生的稀土过渡使用质量因子匹配，与四分之一波长的堆栈作为一个高反射率的背镜，同时抑制寄生损耗通过指数啁啾的多层反射器只在短波长传输。这允许发射率接近与稀土材料的吸收峰重叠的波长的黑体极限，同时有效地减少与不期望的长波长发射相关联的损失。使用这种分层设计，我们获得了34%的TPV效率，这只需要适度的折射率对比度，使其特别适合通过各种技术，包括溅射，旋涂和等离子体增强化学气相沉积制造。(C)2014 AIP Publishing LLC.
In this work, we propose a rare-earth-based ceramic thermal emitter design that can boost thermophotovoltaic (TPV) efficiencies significantly without cold-side filters at a temperature of 1573K (1300 degrees C). The proposed emitter enhances a naturally occurring rare earth transition using quality-factor matching, with a quarter-wave stack as a highly reflective back mirror, while suppressing parasitic losses via exponential chirping of a multilayer reflector transmitting only at short wavelengths. This allows the emissivity to approach the blackbody limit for wavelengths overlapping with the absorption peak of the rare-earth material, while effectively reducing the losses associated with undesirable long-wavelength emission. We obtain TPV efficiencies of 34% using this layered design, which only requires modest index contrast, making it particularly amenable to fabrication via a wide variety of techniques, including sputtering, spin-coating, and plasma-enhanced chemical vapor deposition. (C) 2014 AIP Publishing LLC.