A new method for improving performances of a polycrystalline solar cell

In this paper, we present a two-dimensional polycrystalline solar cell model to determine the parameters of the cell, such as the photocurrent, the dark current and the conversion efficiency. In this model, we consider an exponential doping profile of the p-region of the cell and hence the onset of an electric field in this region in order to reduce the minority carrier recombination at grain boundary and at rear contact. Consequently, this improved conversion efficiency of the cell. In order to optimize conversion efficiency, the presented model is implemented through a simulation program while varying thickness and doping concentration in the p-region of the cell. Compared with the case of Dirac´s function doping profile, the conversion efficiency is maximal in the case of an exponential doping profile.