In this work, three industry-related metallization approaches for silicon heterojunction (SHJ) solar cells are presented which are aiming for a reduction of silver consumption compared to conventional screen-printing of low-temperature silver pastes. The presented results are achieved on large-area cells (area of 244.3 cm2). Firstly, the cell results reveal that with silver-coated copper pastes for screen-printing comparable results as with pure silver pastes can be achieved but with a potentially reduced silver consumption of 30%. Median efficiencies of 21.6% are achieved in both cases utilizing a five busbar cell design. A second approach to reduce the silver consumption is the use of inkjet-printing. The influence of the inkjet-printed layer number per contact finger on the cell performance of busbarless cells is investigated. A maximum conversion efficiency of 23.3% of an inkjet-printed solar cell is achieved within this study. Thirdly, a novel printing technology established at Fraunhofer ISE, called FlexTrail-printing, is introduced. By utilizing the same Ag nanoparticle ink like in the case of inkjet-printing, the finger width is reduced from 75 ± 1 µm down to 16 ± 1 µm on alkaline textured SHJ solar cells. To the authors’ knowledge, this is the smallest feature size ever published on ITO-coated, textured silicon surfaces. A maximum conversion efficiency of 23.7% is measured (busbarless cell). Only 0.3 ± 0.1 mg Ag nanoparticle ink is consumed during FlexTrail-printing on a large-area wafer with a front grid of 80 fingers.
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18 September 2019
PROCEEDINGS OF THE 8TH WORKSHOP ON METALLIZATION AND INTERCONNECTION FOR CRYSTALLINE SILICON SOLAR CELLS
13–14 May 2019
Konstanz, Germany
Article Contents
Research Article|
September 18 2019
Advanced metallization with low silver consumption for silicon heterojunction solar cells Free
Jörg Schube;
Jörg Schube
a)
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Tobias Fellmeth;
Tobias Fellmeth
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Mike Jahn;
Mike Jahn
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Roman Keding;
Roman Keding
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
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Stefan W. Glunz
Stefan W. Glunz
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
2
Albert-Ludwigs-University Freiburg, Laboratory for Photovoltaic Energy Conversion
, Emmy-Noether-Str. 2, 79110 Freiburg, Germany
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Jörg Schube
1,a)
Tobias Fellmeth
1
Mike Jahn
1
Roman Keding
1
Stefan W. Glunz
1,2
1
Fraunhofer Institute for Solar Energy Systems ISE
, Heidenhofstr. 2, 79110 Freiburg, Germany
2
Albert-Ludwigs-University Freiburg, Laboratory for Photovoltaic Energy Conversion
, Emmy-Noether-Str. 2, 79110 Freiburg, Germany
AIP Conf. Proc. 2156, 020007 (2019)
Citation
Jörg Schube, Tobias Fellmeth, Mike Jahn, Roman Keding, Stefan W. Glunz; Advanced metallization with low silver consumption for silicon heterojunction solar cells. AIP Conf. Proc. 18 September 2019; 2156 (1): 020007. https://doi.org/10.1063/1.5125872
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