Enhanced Photon Utilization in Single Cavity Mode Air-Bridge Thermophotovoltaic Cells
Enhanced Photon Utilization in Single Cavity Mode Air-Bridge Thermophotovoltaic Cells
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DOI：
10.1021/acsenergylett.3c00720
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发表时间：
2023-06
影响因子：
22
通讯作者：
Jihun Lim;Bosun Roy-Layinde;B. Liu;A. Lenert;S. Forrest
中科院分区：
文献类型：
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作者：
Jihun Lim;Bosun Roy-Layinde;B. Liu;A. Lenert;S. Forrest
空气桥热光伏 (TPV) 电池可以几乎完全利用带外 (OOB) 光子。然而，空气桥由微米厚的独立式半导体薄膜组成，在制造过程中可能会弯曲。这种弯曲薄膜在半导体和底部金属背表面反射器之间的气隙中支持多种光学腔模式，导致 OOB 反射率 (ROOB) 损失高达 10%。在这里，我们展示了具有极其平坦的 In0.53Ga0.47As TPV 膜的单腔模式，在 1279 K 黑体照明下表现出 ROOB= 98.9 ± 0.1%。剩余的 1.1% 反射损耗归因于自由载流子吸收和腔振荡。对于发射器温度在 900 至 1500 K 之间的情况，平板 TPV 电池的光谱效率为 68.6% 至 76.5%，超过了之前的反射式 TPV 电池，并且与弯曲电池相比提高了 20-30%，在 1279 K 时功率转换效率为 31.7 ± 0.1%。
An air-bridge thermophotovoltaic (TPV) cell can enable nearly complete utilization of out-of-band (OOB) photons. However, the air-bridge consists of a micron-thick free-standing semiconductor membrane that can buckle during fabrication. Such a buckled membrane supports multiple optical cavity modes in the air gap between the semiconductor and the bottom, metal back surface reflector, causing up to 10% loss in OOB reflectance (ROOB). Here we demonstrate a single cavity mode with an extremely flat In0.53Ga0.47As TPV membrane that exhibitsROOB= 98.9 ± 0.1% under 1279 K blackbody illumination. The remaining 1.1% reflectance loss is attributed to free carrier absorption and cavity oscillations. The flat TPV cell exhibits a spectral efficiency ranging from 68.6% to 76.5% for emitter temperatures between 900 and 1500 K, which exceeds that of previous reflective TPV cells, and represents a 20–30% improvement compared to the buckled cell, leading to a power conversion efficiency of 31.7 ± 0.1% at 1279 K.