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Tuning back side passivation for enhancing the performance of PERC solar cells
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2021-08-07 , DOI: 10.1016/j.solmat.2021.111319
Rui Tong , Shicheng Zhang , Dongming Liu , Weipeng Zhang , Yutao Wang , Xiaofeng Liu

In the mono-crystalline silicon passivated emitter and rear cell (PERC), the back side passivation film made up of Al2O3 + SiNx:H stacks is the mainstream design. In this paper, the effect of the thickness of Al2O3 passivation layer on the performance of the solar cell was studied, and the correlation between the refractive index (RI) of SiNx:H layer and the efficiency gain of the solar cell after regeneration was analyzed. The results indicate that the thickness of Al2O3 layer needs to be balanced between the surface passivation and bulk passivation of SiNx:H, and the lower RI of SiNx:H layer shows a better hydrogen passivation capability. During the restoration of the solar cell efficiency, a thinner Al2O3 layer facilitates a faster stabilization of the boron-oxygen complexes. Finally, a new five-layer SiNx:H film was designed for the back side passivation film, and a conversion efficiency of 22.56 % was achieved, which is 0.05 % higher than that of the solar cell with a single-layer SiNx:H film.



中文翻译:

调整背面钝化以提高 PERC 太阳能电池的性能

在单晶硅钝化发射极和背面电池(PERC)中,由Al 2 O 3  + SiN x :H 堆叠构成的背面钝化膜是主流设计。本文研究了Al 2 O 3钝化层厚度对太阳能电池性能的影响,以及SiN x :H层的折射率(RI)与太阳能电池效率增益的相关性。再生后进行分析。结果表明,A1的厚度2 ö 3层需要的SiN的表面钝化和体钝化之间进行平衡X:H,和SiN构成下部RI X:H 层显示出更好的氢钝化能力。在太阳能电池效率的恢复过程中,较薄的 Al 2 O 3层有利于硼氧复合物的更快稳定。最后,为背面钝化膜设计了新的五层 SiN x :H 膜,实现了 22.56 % 的转换效率,比具有单层 SiN x的太阳能电池高 0.05 % : H片。

更新日期:2021-08-07
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