One-dimensional Microstructure Tungsten Gratings for Thermo Photovoltaic Applications

Samah. G. Babiker ； Shuai Yong ； Mohamed Osman Sid-Ahmed ； Xie Ming

《Research Journal of Applied Sciences, Engineering and Technology》 7卷11期 (2014/03) Pp. 2271-2277

並列摘要

In this study, a one-dimensional microstructure tungsten grating is optimized for potential application as Thermo Photovoltaic (TPV) emitter. The influence of gratings geometric parameters on the spectral emittance are studied by using the Rigorous Coupled-Wave Analysis (RCWA). The results show that the spectral emittance is affected by the gratings geometrical parameters and insensitive to the direction. The optimum parameters of the proposed structure are grating period 1.4μm, a filling ratio 0.8 and grating height 0.2μm. A broad peak of highemittance is obtained at wavelengths between 0.5 and 1.8 μm. A peak emittance close to unity at wavelengths between 0.5 and 2μm is achieved and it drops below 0.2 at wavelengths above 2μm. This can be explained by the surface plasmon polaritons excitation coupled with the grating microstructures. At longer wavelengths, the emittance remains low and this is highly desired for thermo photovoltaic applications to reduce the thermal leakage due to low-energy photons that do not produce any photocurrent. The proposed structure can be used as a selective emitter for TPV applications.

並列關鍵字

Emittance ； grating ； Rigorous Coupled-Wave Analysis (RCWA) ； selective emitter ； surface plasmon polaritons ； thermo photovoltaic