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Pilot-line processing of screen-printed Cz-Si MWT solar cells exceeding 17% efficiency

: Clement, F.; Menkö, M.; Hoenig, R.; Haunschild, J.; Biro, D.; Preu, R.; Lahmer, D.; Lossen, J.; Krokoszinski, H.-J.

Volltext urn:nbn:de:0011-n-1436258 (578 KByte PDF)
MD5 Fingerprint: 6ebf3bd6e9c117ab90bfbd27ccc77b16
Erstellt am: 31.8.2012

Institute of Electrical and Electronics Engineers -IEEE-; IEEE Electron Devices Society:
34th IEEE Photovoltaic Specialists Conference, PVSC 2009. Vol.3 : Philadelphia, Pennsylvania, USA, 7 - 12 June 2009
Piscataway/NJ: IEEE, 2009
ISBN: 978-1-4244-2949-3
ISBN: 1-4244-2949-8
ISBN: 978-1-4244-2950-9
Photovoltaic Specialists Conference (PVSC) <34, 2009, Philadelphia/Pa.>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

On the way to higher efficiencies, back contact solar cells are a promising alternative to conventional screen-printed solar cells. Especially, the MWT (metal wrap through) solar cell concept with only a few additional process steps compared to the conventional cell process is appropriate for a fast transfer to industry. The focus of this work is to change the conventional cell process as little as possible and to reduce the time-to-market. Hence, a MWT process with only three screen-printing steps and without efficiency losses is realized by combining the via and the solder pad metallization steps. In comparison with the conventional cell process the number of screen-printing steps is not increased and thus the costs for metallization rise only marginally due to somewhat increased paste consumption. In comparison to a previous approach the additional costs of the MWT process can be significantly reduced. A successful MWT process transfer from Fraunhofer ISE's Photovoltaic Technology Evaluation Center (PV-TEC) pilot-line to the pilot-line of ersol Solar Energy AG is shown. Mean cell efficiencies above 17% and maximum efficiencies of 17.3% are achieved for Cz-Si MWT solar cells within pilot-line production. Moreover, an efficiency gain compared to simultaneously processed, conventionally screen-printed solar cells of 0.3% absolute has already been reached. Furthermore, the influence of p-contact solder pads on the cell efficiency is analyzed in detail by current voltage (IV-) and photoluminescence (PL-) measurements within this work.