Abstract
The crystalline silicon ( c-Si ) thin film solar cell with one-dimensional (1D) sinusoidal grating has been simulated to explore the absorption enhancement, by utilizing COMSOL Multiphysics Rf Module ( 5.3a ). The finite element analysis (FEA) is applied to optimize the geometrical parameter of 1D sinusoidal grating, i.e., slit width ( w ) and film thickness ( t ), for enhancing the light absorption. The slit width is optimized by implementing near-field analysis and far-field analysis at constant periodicity (700 nm). To study the appropriate value of gold (Au) film thickness for the optimization of the grating device, the transmission spectra (?, a ) have been calculated for different Au film thicknesses while shedding light into the device at normal incidence keeping periodicity and slit width constant. The proposed 1D sinusoidal grating offers maximum optical coupling efficiency of 88.5%, with the relative transmission of 0.022 (a.u) at 350 nm optimal slit width. It divulges the fact that such a grating device exhibits less scattering of surface plasmon polariton (SPP) from the grating profile as it supports the most efficient mode (fundamental plasmonic mode), leading to more absorption in a thin active layer.