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"Project FINALE" - Screen and Screen Printing Process Development for Ultra-Fine-Line Contacts below 20µm Finger Width

: Clement, F.; Linse, M.; Tepner, S.; Wengenmeyer, N.; Ney, L.; Krieg, K.; Lorenz, A.; Pospischil, M.; Bechmann, S.; Oehrle, K.; Steckemetz, S.; Preu, R.

Volltext urn:nbn:de:0011-n-5782867 (918 KByte PDF)
MD5 Fingerprint: 3764e8ee3c200abef66cd92f50dd8e89
Erstellt am: 10.3.2020

36th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2019 : Proceedings of the international conference held in Marseille, France, 09-13 September 2019
Marseille, 2019
ISBN: 3-936338-60-4
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <36, 2019, Marseille>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Photovoltaik; Silicium-Photovoltaik; Metallisierung und Strukturierung; Pilotherstellung von industrienahen Si-Solarzellen

Within this work, a new model of the screen printing process is set up in order to improve the understanding of the screen printing process with focus on the interaction between -paste and -screen. First results show that wall slip behavior of the paste can be significantly improved by adapting the screen chemistry, enabling a lower finger resistances and reduced finger widths. A mean contact finger width of wf = 26 µm combined with a mean finger resistance of RFinger = 99 /m shows the high potential of the newly developed screen chemistry using single-step screen printing. Screen openings of wch = 16µm and printed finger widths of wf = 17µm can be realized on textured Si wafers with ARC. Moreover, finger resistance values far below RFinger = 1000 /m are reached for nominal finger widths down to wf = 18µm. This proves the high potential of the single step screen printing process on the way to ultra-fine line contacts in combination with multi-busbar cell layouts. PERC-type Cz-Si solar cells fabricated with a 5 busbar cell layout and a nominal screen opening of wn = 24µm achieve efficiencies up to max = 22.1%. First multi-busbar solar cells with a 18µm nominal screen opening demonstrate a significant Ag reduction.