The front specific contact resistance of the solar cell is the smallest after high temperature rapid firing. The electrical injection significantly increases the Uoc and narrow the difference of hydrogen passivation during firing process. The Eff after electric injection is the highest, with an average of 24.42 %, an increase of 0.36 %.
Therefore, solar cells with excellent electrical performance can be obtained by firing at appropriate peak temperature and firing width, obtaining low contact resistance first, and then increasing the Uoc and Jsc by electric injection. 1. Introduction In recent years, Passivated Emitter and Rear Cell (PERC) has become the mainstream of the market.
The effects of firing process on the electrical properties such as open-circuit voltage, fill factor, and efficiency of the cells were studied. The microstructure of the fired solar cell grid line was observed to analyze the firing mechanism of the TOPCon solar cell and the optimization direction of the firing process. 2. Experimental 2.1.
As a conclusion, all these results above indicate that LeTID in both p -type CM-Si and mc-Si PERC solar cells can be significantly suppressed by forward current injection and annealing, and the pre-treatment parameters are optimized for enhancing the suppression effect. 4.
The Eff after electric injection is the highest, with an average of 24.42 %, an increase of 0.36 %. In the large-scale production of solar cells, metallization is a very important process, which directly affects the opening-circuit voltage, short-cut current, shunt resistance, and fill factor, thus affecting the efficiency of the solar cell.
During the whole process, through carrier injection, the solar cell changes from annealed state to re-ecology. Using this characteristic, the defect recombination of the solar cell is reduced by electric injection.