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Printed Dopant Sources for Locally-Doped SiOx/Poly-Si Passivating Contacts

: Kiaee, Z.; Reichel, C.; Feldmann, F.; Jahn, M.; Huyeng, J.D.; Keding, R.; Hermle, M.; Clement, F.

Fulltext urn:nbn:de:0011-n-5486193 (658 KByte PDF)
MD5 Fingerprint: 3af8b564fe3c909e3e0434bfefa78b03
Created on: 18.6.2019

Verlinden, P. ; WIP - Renewable Energies, München:
35th European Photovoltaic Solar Energy Conference and Exhibition 2018 : Proceedings of the international conference held in Brussels, Belgium, 24 September-28 September 2018; DVD-ROM
München: WIP, 2018
ISBN: 978-3-936338-50-8
ISBN: 3-936338-50-7
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <35, 2018, Brussels>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Photovoltaik / 1-01 Silicium-Photovoltaik; Pilotherstellung von industrienahen Solarzellen; poly-silicon; inkjet; printing; source

This paper presents an industrially relevant solution for the formation of local passivating contacts for back-contact back-junction (BC-BJ) solar cells, based on inkjet- and screen-printing of dopant inks and pastes. The successful realization of passivating contacts utilizing printing technologies is a crucial prerequisite to simplify the fabrication process of BC-BJ cells while approaching theoretical efficiency limit of silicon solar cells. In this work, dopant inks and pastes as well as the printing parameters are tuned in order to establish a high passivation quality within c-Si/SiOx/poly-Si lifetime samples. The impact of the anneal/diffusion conditions on the surface passivation are studied. Excellent passivation quality is achieved for inkjet-printed n-type (phosphorus) poly-Si surfaces with implied open-circuit voltage iVOC of 726 mV and implied fill factor iFF of 86.2%. On p-type, iVOC of 692 mV and iFF of 82.8% and iVOC of 700 mV and iFF of 82.4% where measured by utilizing inkjet and screen-printing, respectively. Similar results were realized by Ion-implanted surfaces, herein used as the reference, underlining the high potential of the investigated printing processes.