WSEAS Transactions on Applied and Theoretical Mechanics
Print ISSN: 1991-8747, E-ISSN: 2224-3429
Volume 9, 2014
Design of a One–Dimensional Multilayer Si / SiO2 Photonic Crystals for Thermophotovoltaic Filters
Authors: , , ,
Abstract: In this paper, a one - dimensional multilayer is optimized for potential applications as thermophotovoltaic (TPV) selective filter. The proposed TPV filter was fabricated through a magnetron sputtering process by using the radio frequency (RF) magnetron sputtering system. The spectral reflectance and transmittance of the proposed TPV filter are measured by using spectral transmittance and reflectance measurement system at wavelength from 0.3μm to 2.5μm at near normal incident 8°.The bidirectional reflectance/transmittance distribution function BRDF/BTDF are measured by three axis automated scatterometer (TAAS). The calculated spectral reflectance and transmittance of the proposed TPV selective filter has shown several peaks and large oscillations, due to the refractive index mismatch between the proposed TPV filter sample and substrate. The measured results show that the proposed filter has high transmittance value in the spectral range of λ<=1.73μm and high BTDF•cosθ value for both of the TE and TM polarization. It also has low BRDF•cosθ value at normal incidence due to detector blocks the laser beam. The measured results are in good agreement with the simulation results. The spectral efficiency of the TPV system with the proposed selective filter is above than 0.43 at emitter temperature >1600K. The results show that the 1D 8-layer Si/SiO2 sample, if used as a selective filter with a low band gap photovoltaic cell (GaSb), would lead to high TPV overall efficiency and high electrical output power. All numerical results are obtained by using the rigorous coupled-wave analysis (RCWA) method.
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Keywords: Thermophotovoltaic, Selective filter, Rigorous coupled wave analysis (RCWA), a magnetron sputtering process, spectral transmittance, bidirectional reflectance/transmittance distribution function
Pages: 187-195
WSEAS Transactions on Applied and Theoretical Mechanics, ISSN / E-ISSN: 1991-8747 / 2224-3429, Volume 9, 2014, Art. #16