多晶硅电池片双面扩散的仿真研究

结合PC1D模拟软件,对减薄至200μm的多晶硅电池片进行双面扩散与背靠背扩散的对比研究。试验表明:双面扩散工艺和背靠背扩散工艺均具有良好的吸杂效果,少子寿命有很大提高,少子扩散长度已大于电池片厚度。双面扩散比背靠背扩散具有更好的吸杂和钝化效果,少子寿命更长。但PC1D软件仿真及试验结果显示,扩散后电池片的转换效率、短路电流、开路电压等电学性能没有显著改善。

Simulation study on double-side diffusion of polysilicon solar cells

In this paper,double-side diffusion and back-to-back diffusion of the multicrystalline silicon solar cells which had been thinned to 200 μm were compared by using the simulation software PC1D.The experiments showed that: double-side diffusion and back-to-back diffusion both had good gettering effect,the minority carrier lifetime had greatly improved,and the minority carrier diffusion length was greater than the cell’s thickness.Compared to the back-to-back diffusion,the double-side diffusion had better effects on gettering and passivation,a higher minority carrier lifetime,but simulation of PC1D and experiments showed that the conversion efficiency,short-circuit current,open circuit voltage and other electrical properties was not significantly improved after spread.