Detection of finger interruptions in silicon solar cells using photoluminescence imaging
Detection of finger interruptions in silicon solar cells using photoluminescence imaging
复制标题
使用光致发光成像检测硅太阳能电池中的手指干扰
DOI:
10.1088/1674-1056/27/6/068801
复制
发表时间:
2018-06
影响因子:
1.7
通讯作者:
Lei Zhang
中科院分区:
文献类型:
--
作者:
Lei Zhang
Finger interruptions are common problems in screen printed solar cells, resulting in poor performance in efficiency because of high effective series resistance. Electroluminescence (EL) imaging is typically used to identify interrupted fingers. In this paper, we demonstrate an alternative method based on photoluminescence (PL) imaging to identify local series resistance defects, with a particular focus on finger interruptions. Ability to detect finger interruptions by using PL imaging under current extraction is analyzed and verified. The influences of external bias control and illumination intensity on PL images are then studied in detail. Finally, in comparison with EL imaging, the using of PL imaging to identify finger interruptions possesses the prominent advantages: in PL images, regions affected by interrupted fingers show higher luminescence intensity, while regions affected by recombination defects show lower luminescence intensity. This inverse signal contrast allows PL imaging to more accurately identify the defect types.
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