铝粉活性对双面PERC太阳电池铝浆性能的影响

EFFECT OF Al POWDER ACTIVITY ON PROPERTIES OF Al PASTE FOR BIFACIAL PERC SOLAR CELLS

探究了铝粉活性对铝浆电阻及双面PERC太阳电池开路电压的影响。实验结果表明:高活性的铝粉制备的铝浆具有较低的方阻、接触电阻及线电阻,且铝硅接触电阻率可低至11.5 mΩ·cm^(2);一定范围内,活性较低的铝粉制备的铝浆具有较高的开路电压,开路电压可达690.774 mV。根据太阳电池的尺寸、钝化膜质量、背面激光开槽面积、主栅数量,通过有针对性地设计铝浆配方,优化铝浆中铝粉的活性,以便达到开路电压和电阻的最佳平衡,从而可以获得更高的太阳电池光电转换效率。

In this paper,the effect of Al powder activity on the resistance of Al paste and the open circuit voltage of bifacial PERC solar cells is investigated.The experimental results show that the Al paste prepared with high activity Al powder has lower square resistance,Al-Si contact resistance and line resistance,and Al-Si contact resistivity can be as low as 11.5 mΩ·cm^(2);Within a certain range,the Al paste prepared from the Al powder with lower activity has a higher open circuit voltage,and the open circuit voltage can reach 690.774 mV.According to the size of the solar cell,the quality of the passivation film,the laser slotted area on the backside,and the number of bus bars,the activity of the aluminum powder in the aluminum paste is optimized by designing the formula of the aluminum paste in a targeted manner,in order to achieve the best balance of open circuit voltage and resistance,and obtain higher photoelectric conversion efficiency of solar cells.