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Technologies for mass production of > 20% efficient P-Type silicon solar cells

: Mack, S.; Wolf, A.; Thaidigsmann, B.; Lohmüller, E.; Jäger, U.; Pospischil, M.; Clement, F.; Eberlein, D.; Preu, R.; Biro, D.

Fulltext urn:nbn:de:0011-n-2669358 (720 KByte PDF)
MD5 Fingerprint: f12d4b2b947ddb874fa3fd52d8952184
Created on: 7.12.2013

Mine, A. ; European Commission:
28th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2013. Proceedings. DVD-ROM : 30 September to 04 October 2013, Paris, France
München: WIP-Renewable Energies, 2013
ISBN: 3-936338-33-7
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <28, 2013, Paris>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Oberflächen: Konditionierung; Passivierung; Lichteinfang; Herstellung und Analyse von hocheffizienten Solarzellen; Pilotherstellung von industrienahen Solarzellen; Industrielle und neuartige Solarzellenstrukturen; Oxidation; SiO2; Passivation; MWT; PERC

This paper summarizes the results of the project “MASSE”, which focused on the research and development of technologies and process sequences for mass production of 20 % efficient monocrystalline p-type silicon solar cells. This goal is addressed by the use of PERC (passivated emitter and rear cell) and MWT-PERC (metal wrap through PERC) structures. Within the frame of the project, several technologies have been investigated in detail and optimised carefully. The various technologies are modular, which allows for an application both in PERC and MWT-PERC structures. We propose the use of thermal oxidation for simultaneous high quality front and rear surface passivation. On high-quality float-zone silicon, which we use for determining the efficiency potential of these structures, the best PERC solar cells achieve a conversion efficiency of 20.0 %; reduced shading in MWTPERC type devices increases this value to 20.3 %. In both cases, screen printing forms the front and rear contacts. The implementation of dispensed silver front contacts in MWT-PERC structures increases the maximum cell efficiency even further to 20.6 %. Solder pads enable module assembly with existing equipment. By using rectangular masks for aperture area definition, conversion efficiencies of 17.7% for PERC and 18.2% for MWT-PERC modules are measured.