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High-efficiency silicon solar cells with boron local back surface fields formed by laser chemical processing

: Kluska, S.; Granek, F.

Postprint urn:nbn:de:0011-n-1893882 (288 KByte PDF)
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Erstellt am: 24.5.2013

IEEE Electron Device Letters 32 (2011), Nr.9, S.1257-1259
ISSN: 0741-3106
ISSN: 0193-8576
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Dotierung und Diffusion; Kontaktierung und Strukturierung; Herstellung und Analyse von hocheffizienten Solarzellen; Industrielle und neuartige Solarzellenstrukturen; Produktionsanlagen und Prozessentwicklung

The successful implementation of industrially feasible local boron dopings as local back surface field (LBSF) for high-efficiency silicon solar cells processed with laser chemical processing (LCP) is demonstrated for the first time. The processed passivated-emitter rear locally diffused solar cells with LCP LBSFs show cell efficiencies of up to 20.9% with a cell efficiency benefit of up to 0.3-0.4%abs. in comparison to the reference passivated emitter and rear cells processed with a doping-free LCP opening. The results show the potential of LCP to create boron dopings in order to decrease the contact resistance and reduce the minority carrier recombination at the local metal contacts in order to improve the fill factor and the open-circuit voltage, respectively.