2D Simulation of Recombinant Activity in Polysilicon Solar Cells Under Light Excitation as a Function of Trap Position

In this article, an approach to a 2D model of homojunction poly-Si/c-Si solar cells is demonstrated, in which the effects of grain joints on the electrical properties of the solar cell are analyzed. Using the Silva co TCAD program, we were able to create a model of a solar cell consisting of grains separated from each other by grain boundaries. The physical models of the grain boundaries were introduced onto polysilicon. Based on experimental parameters, the grains were designed with an average size rangingfrom 40 to 80 [nm]. The density of traps stats at the grain boundaries between 4 ~ 9.10
¹⁶
[1Icm
²
] at an energy level between 0.15 ~0.17[eV]. The results clearly show that the efficiency of solar cell composed of polysilicon do with large grains is very high, compared to solar cell composed of poly-silicon-do with small grains, which It allows a large number of charge carriers to pass well due to the direct relationship between the grains and the grain joints. “The larger the size of the grains, the lower the density of the grain joints, and thus the cell yield is greater.”