Abstract
Silicon solar cell is now accepted as the better energy usage system according to the capital investment but we all know that it is not independently very much efficient. So far, it is simulated with graphene to enhance the output. The paper will show and study the factors like current density, absorption coefficient and wavelength spectrum of sun are studied by relating their characteristics and equation to each other to clear some dependency scenario of solar energy on graphene. Here, the equations are implemented by modulating the Simulink model and therefore, it is synthesized by Finite Difference Method using MATLAB tool, and the resulting graphs are obtained by SIMULINK toolbox through calibrating the parameters. The radiative recombination in GaAs tends to give loss of nearly similar to 5% of light generated carrier loss. Because of large optical absorption coefficient of GaAs, calculation of generation rate of carrier charges is done by not including light's multi-reflection in solar cell.