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Removal of Trace Metals Using a Biodegradable Complexing Agent

: Treichel, H.; Goldstein, A.; George, M.; Bohling, D.; Rentsch, J.; Oltersdorf, A.; Zimmer, M.; Ostrowski, S.; Mowat, I.; Wang, L.; Kern, W.

Volltext urn:nbn:de:0011-n-2125848 (1013 KByte PDF)
MD5 Fingerprint: a1c75f4ffbb23bf08c2a48b312880923
Erstellt am: 7.9.2012

Photovoltaics International (2011), Nr.12
ISSN: 1757-1197
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Produktionsanlagen und Prozessentwicklung

Processing silicon substrates for PV applications involves texturing, cleaning and/or etching wafer surfaces with chemical solutions. Depending on the cleanliness of the industrial equipment and the purity of the chemical solutions, surface contamination with metals or organic residues is possible [1]. The presence of trace contamination at PV junctions leads to both mid-level traps and photonic defects, which ultimately cause reduced efficiency and rapid cell degradation. Metallic impurities have a greater impact on PV cell lifetime due to their deeper energy levels in the silicon band gap [2]. On the other hand, non-metallic impurities may modify the electrical activity of PV cells because these species involve complex interactions with the host silicon lattice and its structural defects. In other words, very small amounts of contamination can result in poor PV efficiency. This paper presents an overview of the effects of adding a biodegradable complexing agent in cleaning and rinsing baths to minimize surface contamination and thereby enhance solar cell efficiency.