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Development of a 21% back-contact monocrystalline silicon solar cell for large-scale production

: Huljic, D.M.; Zerres, T.; Mohr, A.; Maydell, K. von; Petter, K.; Müller, J.W.; Feist, H.; Harder, N.-P.; Engelhart, P.; Brendemühl, T.; Grischke, R.; Meyer, R.; Brendel, R.; Granek, F.; Grohe, A.; Hermle, M.; Schultz, O.; Glunz, S.W.

Fulltext urn:nbn:de:0011-n-2096400 (351 KByte PDF)
MD5 Fingerprint: 6f7f29509ffd0d687136865e5468dff8
Created on: 29.9.2012

Poortmans, J. ; European Commission, Joint Research Centre -JRC-:
21st European Photovoltaic Solar Energy Conference 2006. Proceedings. CD-ROM : Proceedings of the international conference held in Dresden, Germany, 4 - 8 September 2006
München: WIP-Renewable Energies, 2006
ISBN: 3-936338-20-5
European Photovoltaic Solar Energy Conference <21, 2006, Dresden>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

As a part of its cost reduction strategy, Q-Cells AG is exploring opportunities to fabricate mono-Si solar cells with more than 20% efficiency in mass production. In a joint R&D project, we are developing a back junction cell whose design is compatible with a wider range of silicon material qualities. Two-dimensional device simulations confirm an efficiency potential above 20% if wafers with lifetime > 600 ?s and resistivity of 1-10 ohm cm are used. To obtain this specification, a tight rear pattern is required. Laser processing is identified as a promising patterning technique and can be well integrated in an industrial processing sequence. When fabricating laboratory cells according to this processing sequence, we have obtained efficiencies up to 21% on p- and n-type FZ wafers. On n-type Cz silicon a confirmed efficiency of 21% has been achieved, underlining the feasibility of our back junction solar cell approach. Based on these results, Q-Cells AG has decided to build up a pilot line in Thalheim, Germany.