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Approach to the physical origin of breakdown in silicon solar cells by optical spectroscopy

 
: Gundel, P.; Kwapil, W.; Schubert, M.C.; Seifert, H.; Warta, W.

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Fulltext urn:nbn:de:0011-n-1556730 (2.0 MByte PDF)
MD5 Fingerprint: 6c6749e6dedb3d5817aae04d91900064
Created on: 20.12.2014


Journal of applied physics 108 (2010), No.12, Art. 123703, 5 pp.
ISSN: 0021-8979
ISSN: 1089-7550
English
Journal Article, Electronic Publication
Fraunhofer ISE ()
Siliciummaterialcharakterisierung; Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Charakterisierung von Prozess- und Silicium-Materialien; Messtechnik und Produktionskontrolle; Feedstock; Kristallisation und Wafering; Charakterisierung; Qualitätssicherung und Messtechnikentwicklung: Material; Zellen und Module

Abstract
The electrical breakdown of silicon solar cells at low reverse currents has recently gained increased attention. In this study we investigate the physical properties of prebreakdown sites with high resolution spectroscopy techniques. These techniques comprise the measurement of the electroluminescence under reverse voltage, microphotoluminescence spectroscopy, and micro-Raman spectroscopy. The measurements show very high levels of stress at the prebreakdown sites, an increase in the breakdown size with applied reverse bias and redshift in the breakdown electroluminescence spectrum with increasing onset voltage. The results are tentatively explained by a lower bandgap energy at the breakdown sites, which could be caused by stress.

: http://publica.fraunhofer.de/documents/N-155673.html