Modelling of 1D Triangular Ag-Grating for Enhanced Absorption in Thin Film Solar Cell

Abstract This paper mainly focuses on Design and Optimization of 1-D triangular grating for Solar cell applications using Silver Metal. The weak light trapping in the active layer of thin film solar cells is a major issue in solar cell technology. Periodic grating is one of the methods used to improve light absorption in the thin film solar cell's substrate. The current study presents the effect of a 1-D triangular grating device on solar cell absorption enhancement. The 5.3a COMSOL RF module is used for the desired geometry comprising silicon (c-Si) crystalline as the substrate. The slit width of grating is optimized using near and far-Field Analysis in the designed structure magnifies the light-trapping process in the thin-film solar cell. For this purpose, the transmission spectrums are analyzed at various slit angles angle (142 o −148 o ), constant film thickness (100nm), and constant periodicity (700nm). The optimal value of the slit width is obtained as 350nm, which is half the frequency. Variation of θ= 144.57° yielded the highest value of electric field which corresponds to lowest value of relative transmission in full width at half maxima peak. The transmission spectra were taken by varying film angle (142 o −148 o ) at normal incidence to observe the acceptable value of film thickness for the optimization of the grating system. Such optimization is quite helpful for improvement in the light absorption hence over all efficiency of thin film solar cells.