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Efficiency enhancement of bifacial PERC solar cells with laser‐doped selective emitter and double‐screen‐printed Al grid
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2018-04-14 , DOI: 10.1002/pip.3013 Weiliang Wu 1, 2 , Zhongwei Zhang 2 , Fei Zheng 2 , Wenjie Lin 1 , Zongcun Liang 1, 3 , Hui Shen 1, 3
Progress in Photovoltaics ( IF 8.0 ) Pub Date : 2018-04-14 , DOI: 10.1002/pip.3013 Weiliang Wu 1, 2 , Zhongwei Zhang 2 , Fei Zheng 2 , Wenjie Lin 1 , Zongcun Liang 1, 3 , Hui Shen 1, 3
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We report that the application of a laser‐doped selective emitter (SE) can improve the trade‐off between the recombination in the emitter and the Ag‐Si specific contact resistance and that a double‐screen‐printed rear aluminum grid can decrease the series resistance in the industrial bifacial passivated emitter and rear cell (PERC). Our results reveal that a front‐side efficiency of 21.9% can be achieved in the PERC (SE)+ solar cell by using low surface‐recombination Al2O3/SiNx films as passivation layers, low‐recombination emitter, and low resistive Ag‐Si contact with an optimized sheet resistance of the lightly doped area of SE with 125Ω/sq and sheet resistance of the highly doped area of SE with 70 Ω/sq. The highest front‐side efficiency of 22.0%, with open‐circuit voltage of 680 mV, short‐circuit current density of 40.1 mA/cm2, and fill factors of 80.8%, is obtained by using double‐screen‐printed rear Al grid process, which is 0.1% higher than the best PERC (SE)+ solar cell. The rear‐side double‐layer antireflection coating consists of 50 nm SiNx:H (n = 2.1) and 10 nm SiNx:H (n = 2.37), which enables a large bifacial gain with the output power density PMPP of 25.5 mW/cm2 in the PERC (SE)+ solar cell by using double‐screen‐printed rear Al grid process when rear‐side illumination intensity Erear = 0.25 suns.
中文翻译：
激光掺杂的选择性发射极和双丝网印刷的Al栅提高了双面PERC太阳能电池的效率
我们报告说，使用激光掺杂的选择性发射极（SE）可以改善发射极的复合与Ag-Si比接触电阻之间的折衷，并且双丝网印刷的背面铝网格可以减少串联工业双面钝化发射极和后电池（PERC）中的电阻。我们的结果表明，使用低表面重组Al 2 O 3 / SiN x可以在PERC（SE）+太阳能电池中实现21.9％的前端效率。薄膜作为钝化层，低复合发射极和低电阻Ag-Si接触时，SE轻掺杂区的最佳薄层电阻为125Ω/ sq，SE高掺杂区的薄层电阻为70Ω/ sq。通过使用双面丝网印刷的背面Al网格，可以实现最高的正面效率22.0％，开路电压为680 mV，短路电流密度为40.1 mA / cm 2，填充系数为80.8％。该工艺比最佳的PERC（SE）+太阳能电池高出0.1％。背面双层抗反射涂层由50 nm SiN x：H（n = 2.1）和10 nm SiN x：H（n = 2.37）组成，可在输出功率密度P MPP为25.5的情况下实现较大的双面增益。毫瓦/厘米2当后侧照明强度E Rear = 0.25 suns时，通过双面丝网印刷的后Al网格工艺在PERC（SE）+太阳能电池中进行测试。
更新日期：2018-04-14
中文翻译：
激光掺杂的选择性发射极和双丝网印刷的Al栅提高了双面PERC太阳能电池的效率
我们报告说，使用激光掺杂的选择性发射极（SE）可以改善发射极的复合与Ag-Si比接触电阻之间的折衷，并且双丝网印刷的背面铝网格可以减少串联工业双面钝化发射极和后电池（PERC）中的电阻。我们的结果表明，使用低表面重组Al 2 O 3 / SiN x可以在PERC（SE）+太阳能电池中实现21.9％的前端效率。薄膜作为钝化层，低复合发射极和低电阻Ag-Si接触时，SE轻掺杂区的最佳薄层电阻为125Ω/ sq，SE高掺杂区的薄层电阻为70Ω/ sq。通过使用双面丝网印刷的背面Al网格，可以实现最高的正面效率22.0％，开路电压为680 mV，短路电流密度为40.1 mA / cm 2，填充系数为80.8％。该工艺比最佳的PERC（SE）+太阳能电池高出0.1％。背面双层抗反射涂层由50 nm SiN x：H（n = 2.1）和10 nm SiN x：H（n = 2.37）组成，可在输出功率密度P MPP为25.5的情况下实现较大的双面增益。毫瓦/厘米2当后侧照明强度E Rear = 0.25 suns时，通过双面丝网印刷的后Al网格工艺在PERC（SE）+太阳能电池中进行测试。
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