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Silicon solar cells with screen-printed front side metallization exceeding 19% efficiency

 
: Schultz, O.; Mette, A.; Preu, R.; Glunz, S.W.

:
Fulltext urn:nbn:de:0011-n-735217 (366 KByte PDF)
MD5 Fingerprint: 2b405efb9cfdb91744929b131a9962ab
Created on: 29.9.2012


European Commission, Joint Research Centre -JRC-:
The compiled state-of-the-art of PV solar technology and deployment. 22nd European Photovoltaic Solar Energy Conference, EU PVSEC 2007. Proceedings of the international conference. CD-ROM : Held in Milan, Italy, 3 - 7 September 2007
München: WIP-Renewable Energies, 2007
ISBN: 3-936338-22-1
pp.980-983
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <22, 2007, Milano>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()

Abstract
Thermal oxides are commonly used for the surface passivation of high-efficiency crystalline silicon solar cells and have led to the highest conversion efficiencies of mono- and multicrystalline silicon reported so far. In contrast to the laboratory fabrication of solar cell structures with lithographically defined and evaporated front contacts, in this study we combine several technologies ready for industrial implementation. On the front side, surface passivation of the lowly doped emitters up to 90 ?/sq is achieved with sputtered SiNx:H, the contact grid is created with screen-printing of a hotmelt silver paste, the electrical properties of the grid are improved by lightinduced silver plating. Since contact formation on the front requires a short high-temperature firing process, the rear surface passivation layer needs to be thermally stable. A wet thermal oxidation is applied on the rear and the surface recombination velocity of the fired oxide is experimentally determined to be below S <= 38 cm/s at the end of the process sequence. This includes evaporation of aluminium on the rear, the formation of laser-fired contacts and a short annealing process under air ambience. Monocrystalline solar cells were produced and 19.3% efficiency were obtained as best value on 4 cm2 cell area.

: http://publica.fraunhofer.de/documents/N-73521.html