Thermophotovoltaic Emitter Based On Free Lithography Thin Film Nano Structure Metamaterials

Abstract

The present study has focused on designing and enhancing the efficiency of Thermophotovoltaic emitter by free lithography method. The all selective band and wide angle emissivity below cut off wavelength were obtained. The metamaterial nano-hole was designed from Titanium and Aluminum oxide by using COMSOL Multiphysics software. To get broadband emission, the geometric parameter such as the radius, thickness of dielectric and width of unit cell were optimized, while parameters such as the thickness of nano hole and ground Titanium thickness were fixed in this study. The numerical simulation results showed that the proposed emitter had an average emissivity of 0.964 within the targeted wavelength of 3μm. We obtained high emissivity because of excitation physical mechanism of absorption like Surface Plasmon polariton and magnetic polariton, unlike blackbody the designed nano -hole metamaterial emitter emit only selective wavelength of radiation. Moreover, the designed nano -hole metamaterial emitter obtained 64.53%, 71.74%, 75.47%, 77.61%, 78.96%, 79.87%, 80.51%, 80.99% and 81.36%with InAsSbP cell of 3μm or 0.41eV band gap at 600 K, 800 K, 1000 K, 1200 K, 1400 K, 1600 K, 1800 K , 2000 K and 2200 K respectively. In general as temperature increases from 600 K to 2200 K the spectral efficiency increase In general at high temperature TPV efficiency was high as spectral efficiency at 2200 K is 81.36% and at 1000 K is 75.47%. This result showed us the TPV system requires high temperature to enhance efficiency.