26.1%-efficient POLO-IBC cells: Quantification of electrical and optical loss mechanisms
26.1%-efficient POLO-IBC cells: Quantification of electrical and optical loss mechanisms
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DOI：
10.1002/pip.3098
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发表时间：
2019-11-01
影响因子：
6.7
通讯作者：
Peibst, Robby
中科院分区：
文献类型：
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作者：
Hollemann, Christina;Haase, Felix;Peibst, Robby
我们给出了具有钝化POLO触点的双极性交叉背接触（IBC）太阳能电池的实验结果，它们之间有一个标称的本征多晶硅区。我们在1.3 ω cm和80 ω cm p型FZ晶圆上的效率分别为26.1%和24.9%，在2 ω cm n型Cz晶圆上的效率分别为24.6%。初始测量的表面钝化后电池的隐含效率电位非常相似，分别为26.8%，26.8%和26.4%。我们将效率电位和最终电流电压测量值之间的差异归因于退化、周长、串联和分流电阻损耗，我们通过寿命测量来量化这些损耗。结合这些测量和有限元模拟，我们确定了标称本禀多晶硅区域的表面复合速度在13到21 cm s（-1）之间。使用相同的方法，我们分析了电池加工过程中前表面复合速度的增加，对于1.3 ω cm从2到10 cm s(-1)，对于80 ω cm从0.5到2.3 cm s（-1）。这导致在低掺杂块状材料上制造的电池更容易受到工艺引起的表面钝化质量退化的影响。我们进一步确定了电池的理论极限，首先理想化了重组（1.3 ω cm为28%，80 ω cm为28.2%），其次理想化了太阳能电池的光学特性（29.4%和29.5%）。
We present experimental results for interdigitated back contacted (IBC) solar cells with passivating POLO contacts for both polarities with a nominal intrinsic poly-Si region between them. We reach efficiencies of 26.1% and 24.9% on a 1.3 omega cm and 80 omega cm p-type FZ wafer and 24.6% on a 2 omega cm n-type Cz wafer, respectively. The initially measured implied efficiency potentials of the cells after passivating the surfaces are very similar, namely, 26.8%, 26.8%, and 26.4%, respectively. We attribute the difference between the efficiency potential and the final current-voltage measurement to degradation, perimeter, and series and shunt resistance losses, which we quantify by lifetime measurements. With these measurements in combination with a finite element simulation, we determine the surface recombination velocity in the nominal intrinsic poly-Si region to be in the range from 13 to 21 cm s(-1). Using the same approach, we analyze the increase of the front surface recombination velocity during cell processing from 2 to 10 cm s(-1) for the 1.3 omega cm and from 0.5 to 2.3 cm s(-1) for the 80 omega cm. This leads to the fact that cells fabricated on lowly doped bulk material are more vulnerable to a process-induced degradation of the surface passivation quality. We further determine the theoretical limits of the cells by firstly idealizing the recombination (28% for 1.3 omega cm and 28.2% for 80 omega cm) and secondly also idealizing the optics of the solar cells (29.4% and 29.5%).