论文标题
光载体能量转换的光谱选择性纳米光元元细胞的光电分析
Optoelectronic Analysis of Spectrally Selective Nanophotonic Metafilm Cell for Thermophotovoltaic Energy Conversion
论文作者
论文摘要
从理论上讲，这项工作基于基于不对称的Fabry-Perot共振腔结构的频谱选择性TPV细胞，并具有亚100-nm气体层。超薄纳米光细胞结构的模拟光谱特性在带隙上方表现出高吸收峰，这是由于对电磁场的干扰效应在顶部和底部银电极之间的气体层内部增强，而由于金属的高反射率高，因此次型隙吸收率高于几个百分之几。与独立式细胞结构相比，在低于100-nm的气体层中，在带有带隙的特定频率下的吸收增强量接近20倍。此外，将薄薄的MOOX掺入元素细胞结构中作为孔传输层，以考虑在实践中收集电荷收集。通过考虑辐射和非辐射重组（冲击式雷德大厅和俄想要）的严格光电分析，预计纳米光细胞可实现22.8％的TPV效率，输出功率为0.62 w/cm2，黑色发射器在1500 K中，由于光谱在1500 k中增强了孔的吸收率和低分子的bandsumption subsptions bandsumpty sabsumption subsumpty和subsumptimption。通过理想的选择性发射极，在实践中很难与热稳定性问题一起实现，可以通过消除子带gap光子来进一步提高效率至28％。拟议的谱选择性纳米光元元素细胞可能是实现高效率和低成本TPV能量转化的可行途径。
This work theoretically explores a spectrally selective TPV cell based on an asymmetric Fabry-Perot resonance cavity structure with sub-100-nm GaSb layer. The simulated spectral property of the ultrathin nanophotonic cell structure exhibits a high absorption peak above the bandgap due to the interference effect with electromagnetic field enhanced inside the GaSb layer between top and bottom silver electrodes, while the sub-bandgap absorption is as low as a few percent because of high reflectivity of the metal. An absorption enhancement nearly 20 times at particular frequency above bandgap is achieved within the sub-100-nm GaSb layer with the nanophotonic cell structure compared to the free-standing one. Besides, a thin layer of MoOx is incorporated into the metafilm cell structure as a hole transport layer to consider the charge collection in practice. With rigorous optoelectronic analysis by considering both radiative and nonradiative recombinations (Shockley-Reed-Hall and Auger), the nanophotonic cell is predicted to achieve a TPV efficiency of 22.8% and output power of 0.62 W/cm2 with a black emitter at 1500 K due to spectrally enhanced in-band absorption and low sub-bandgap absorption. With an ideal selective emitter which is hard to achieve in practice along with thermal stability concerns, the efficiency can be further improved to 28% by eliminating sub-bandgap photons. The proposed spectrally selective nanophotonic metafilm cell could be a viable route to achieve high-efficiency and low-cost TPV energy conversion.
