背接触太阳电池的背面设计优化

利用quokka3仿真软件建立三维模型,对n型叉指背接触(IBC)单晶硅太阳电池的单元电池结构设计和栅线参数进行了仿真优化,并通过激光和丝网印刷进行了实验验证。实验结果表明,在不同IBC单元电池结构设计下,当p+发射区与n+背表面场区的宽度比值为4时,IBC太阳电池效率比宽度比值为2.3时的高0.11%。可通过减小单元电池宽度,增大p+发射区与n+背表面场区的宽度比值来获得更高的IBC太阳电池效率。在相同单元电池结构设计下,当细栅线宽度从40μm增加到60μm时,IBC太阳电池效率能够提高0.18%。且相比4主栅,6主栅IBC太阳电池效率可提高0.09%。因此,增加副栅线宽度和主栅线数量有利于IBC太阳电池效率的提升。

Back Design Optimization of Back Contact Solar Cell

The unit cell structure design and grid line parameters of the n-type interdigitated back contact(IBC)monocrystalline silicon solar cell were simulated and optimized by building a3 D model with quokka3 simulation software,and the experimental verification was completed by laser and screen printing.The experimental results show that with the design of different IBC unit cell structures,when the width ratio of the p+emitting area and n+back surface field area is 4,the efficiency of the IBC solar cell is 0.11%higher than that of the width ratio of 2.3.Higher IBC solar cell efficiency can be obtained by reducing the width of the unit cell and increasing the width ratio of the p+emitter region and the n+back surface field area.With the same unit cell structure design,when the width of the thin grid line is increased from40μm to 60μm,the efficiency of the IBC solar cell can be increased by 0.18%.In addition,compared with4-busbar IBC solar cell,the efficiency of 6-busbar IBC solar cell can be increased by 0.09%.Therefore,increasing the width of the sub-grid line and the number of the busbar are beneficial to the improvement of the IBC solar cell efficiency.