Influence of the shape of the grain boundary on the I-V characteristic, power and diffusion capacity of the cylindrical grain solar cell

In this study, a numerical simulation of a three-dimensional model was carried out to analyze the excess minority carrier density in the base of a bifacial polycrystalline silicon solar cell composed of cylindrical grains. The solution obtained is adapted to boundary conditions that take into account the shape of the grain boundaries. The idea of the shape of the grain boundaries was used to characterize the charge carrier density of the solar cell illuminated from both sides and to evaluate the I-V characteristic, the power and the diffusion capacity. Plots of charge carrier density, power and diffusion capacity were used to investigate the influence of grain boundary shape on the electrical parameters of the n+-p-p+ solar cell. The results indicate that the grain boundary size plays a very significant role on the production activity of the solar cell. Therefore, this study highlights the importance of production losses in the cell due to the shape of the grain boundaries.