热光电伏打
光电子学
纳米光子学
材料科学
带隙
吸收(声学)
共发射极
能量转换效率
宽禁带半导体
原子层沉积
光学
图层(电子)
纳米技术
物理
复合材料
作者
Qing Ni,Payam Sabbaghi,Liping Wang
标识
DOI:10.1016/j.jqsrt.2021.107625
摘要
This work theoretically studies a spectrally selective nanophotonic cell based on an asymmetric Fabry-Perot resonance cavity structure with sub-100-nm GaSb layer for improving the thermophotovoltaic (TPV) energy conversion performance. The simulated spectral property of the ultrathin metafilm 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-Read-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 the efficiency can be further improved to 28% by eliminating sub-bandgap photons. While selective emitters still endure the challenges in perfect spectral emittance and high-temperature stability in practice, the proposed wavelength-selective nanophotonic metafilm cell could be a viable route to achieve high-efficiency and low-cost TPV energy conversion.
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