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Dispensing of Low-Temperature Silver Pastes

: Gensowski, K.; Jimenez, A.; Tepner, S.; Bujnoch, E.; Muramatsu, K.; Pospischil, M.; Clement, F.


Tous, L.:
9th Workshop on Metallization and Interconnection for Crystalline Silicon Solar Cells. Proceedings : 5-6 October 2020, Genk, Belgium, Online Event
New York, N.Y.: AIP Press, 2021 (AIP Conference Proceedings 2367)
ISBN: 978-0-7354-4101-9
Art. 020007, 11 pp.
Workshop on Metallization & Interconnection for Crystalline Silicon Solar Cells <9, 2020, Online>
Conference Paper
Fraunhofer ISE ()
Photovoltaik; Silicium-Photovoltaik; Metallisierung und Strukturierung

This paper shows the application of three low-temperature silver pastes on silicon heterojunction (SHJ) solar cells and Cu(In1-xGax)Se2 modules by parallel dispensing and flatbed screen printing. The goal was to improve the finger shape as well as to increase the applicable process velocity resulting in reduced silver consumption per SHJ solar cell. In case of the thin-film technology an advantageous electrical performance of applying a front contact metallization on the modules was demonstrated. By dispensing optimized paste formulations, the core finger width was reduced to wcore = 25 µm and the optical aspect ratio was increased to ARo = 0.55 obtaining an efficiency gain of Δη = 0.3%abs. compared to the screen-printed reference on SHJ solar cells. Additionally, a simple integration solution for the parallel dispensing into existing industrial solar cell metallization process line was presented.