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Status and perspectives on n-type silicon solar cells with aluminium-alloyed rear emitter

 
: Schmiga, C.; Rauer, M.; Rüdiger, M.; Glatthaar, M.; Glunz, S.W.

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Fulltext urn:nbn:de:0011-n-2366211 (1.4 MByte PDF)
MD5 Fingerprint: 85846a8dc9d8a70b8c610dd24de79955
Created on: 4.5.2013


Nowak, S. ; European Commission:
27th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2012. DVD-ROM : Proceedings of the international conference held in Frankfurt, Germany, 24 - 28 September 2012
München: WIP-Renewable Energies, 2012
ISBN: 3-936338-28-0
pp.915-918
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <27, 2012, Frankfurt>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Dotierung und Diffusion; Herstellung und Analyse von hocheffizienten Solarzellen; Industrielle und neuartige Solarzellenstrukturen

Abstract
This study summarises a detailed characterisation of structural and electrical properties of full-area and local aluminium-doped p+ Si (Al-p+) regions alloyed from screen-printed pastes for the application as rear emitters in n-type silicon solar cells. We discuss the impact of the Al doping profile depth on the saturation current density for non-passivated and surface-passivated full-area Al-p+ emitters and show the prerequisites for an effective passivation. The influence of a modified Al paste composition on the alloying process of local Al-p+ structures is demonstrated. The results of these investigations have enabled us to further improve the performance of our n+np+ Al rear emitter solar cells featuring a homogeneous phosphorus-diffused n+ front surface field and aerosol-printed and silver-plated front contacts. For large-area n-type Si solar cells (143.5 cm2) with a full-area surface-passivated Al-p+ rear emitter, we have achieved a record-high efficiency of 20.0 %. Solar cells with local Al-p+ emitters in the passivated rear Si surface have reached an efficiency of 19.7 %, fabricated by using a simplified processing sequence and, thus, turning out to be a very promising cell concept.

: http://publica.fraunhofer.de/documents/N-236621.html