design and simulation of broadband multi-layered reflection diffraction grating for using in the silicon solar cells

in this paper, we have performed mathematical analysis of diffraction grating. to prove diffraction, we have used fourier method that used for the analysis of periodic structures. then some simulations have performed for different value of design parameters. the results showed that this diffraction grating create an excellent reflection at a broadband when it has been used as the back layer in a silicon solar cell. furthermore, to have the best diffractive structure, we have scanned reflectance according to the grating parameters. the results of simulation show, when we consider optimal value for design parameter (λ_b, d), the maximum reflectivity of about 97.11% is obtained for the structure.