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Industrial type CZ silicon solar cells with screen-printed fine line front contacts and passivated rear contacted by laser firing

: Hofmann, M.; Erath, D.; Bitnar, B.; Gautero, L.; Nekarda, J.; Grohe, A.; Biro, D.; Rentsch, J.; Preu, R.

Fulltext urn:nbn:de:0011-n-2096277 (491 KByte PDF)
MD5 Fingerprint: 012aaf73c07e45e0ebfdce6faa7ee11f
Created on: 1.9.2012

Lincot, D. ; European Commission, Joint Research Centre -JRC-:
The compiled state-of-the-art of PV solar technology and deployment. 23rd European Photovoltaic Solar Energy Conference, EU PVSEC 2008. Proceedings. CD-ROM : Held in Valencia, Spain, 1 - 5 September 2008; Proceedings of the international conference
M√ľnchen: WIP-Renewable Energies, 2008
ISBN: 3-936338-24-8
ISBN: 978-3-936338-24-9
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <23, 2008, Valencia>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

Large-area (125x125 mm2) solar cells using standard CZ material and a close-to-industry front structure including a diffused POCl3 emitter, a SiNx:H anti-reflection coating and screen-printed contacts which were fine-line printed and thickened by light-induced silver plating were manufactured applying a dielectrically passivated and locally contacted rear structure. The rear passivation was achieved by a PECVD stack of SiOxNy:H and SiNx:H. The rear Al layer on top of the dielectric was screen-printed and co-fired with the front contacts. The local rear contacts were subsequently prepared by laser-firing. The best dielectrically passivated LFC (Al-BSF reference) cell showed VOC=622 mV (614 mV), JSC=36.2 mA/cm2 (35.6 mA/cm2), FF=78 % (79 %) which ends up in an energy conversion efficiency of 17.5 % (17.4 %). The passivated LFC cell clearly outperforms the Al-BSF reference when looking at IQE data. Light microscope images and surface topography measurements of the front contacts are presented.