Fineline printing options for high efficiencies and low Ag paste consumption

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Hannebauer, H.; Dullweber, T.; Falcon, T.; Brendel, R.: Fineline printing options for high efficiencies and low Ag paste consumption. In: Energy Procedia 38 (2013), S. 725-731. DOI: https://doi.org/10.1016/j.egypro.2013.07.339

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In this paper, we investigate and compare three different fine line printing techniques for the silver front side metallization of industrial-type silicon solar cells: single print, dual print and print-on-print. We produce solar cells using the same screen or stencil aperture of 40 μm and about 92 fingers and obtain finger widths below 60 μm for all three approaches. The print-on-print process achieves the highest finger heights of 20 μm after firing but with quite strong finger height variation. In contrast, the dual printed fingers have a very flat surface with a finger height of 14.5 μm which leads to the highest cross-section area of 530 μm2 of the three techniques. The single print shows the lowest cross-section area of 390 μm2 due to the lowest average finger height. The measured finger line resistance correlates with the finger cross-section area. The dual print allows us to use a non-firing through bus bar paste which increases the V oc by 2 mV and hence achieves the highest efficiency of 19.1% using full-area Al-BSF cells. Due to an optimized bus bar screen print in combination with only 30 μm finger aperture, the dual print has the lowest Ag paste consumption of only 75 mg/wafer, one of the lowest Ag paste consumption that has been reported so far. A first batch of PERC solar cells with dual-printed Ag front contacts shows efficiencies up to 19.6%.
License of this version: CC BY-NC-ND 3.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2013
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 122 56.74%
2 image of flag of United States United States 31 14.42%
3 image of flag of China China 18 8.37%
4 image of flag of No geo information available No geo information available 7 3.26%
5 image of flag of United Kingdom United Kingdom 7 3.26%
6 image of flag of India India 4 1.86%
7 image of flag of Netherlands Netherlands 3 1.40%
8 image of flag of Taiwan Taiwan 2 0.93%
9 image of flag of France France 2 0.93%
10 image of flag of Asia/Pacific Region Asia/Pacific Region 2 0.93%
    other countries 17 7.91%

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