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Impact of compensated solar-grade silicon on Czochralski silicon wafers and solar cells

: Rein, S.; Kwapil, W.; Geilker, J.; Emanuel, G.; Spitz, M.; Reis, I.; Weil, A.; Biro, D.; Glatthaar, M.; Soiland, A.-K.; Enebakk, E.; Tronstad, R.

Fulltext urn:nbn:de:0011-n-1435922 (194 KByte PDF)
MD5 Fingerprint: 9c0cc3d224ae47d36d1aeb72f1f5bf61
Created on: 18.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

Alternative feedstock production routes avoiding the gaseous phase during the purification of the silicon result in significantly increased boron and phosphorus concentrations, which leads to compensation effects in the material. We studied Cz crystals with different mix-in ratios of compensated SoG silicon feedstock from Elkem Solar (100%, 50%, 33% and 0%) regarding the impurity content, the specific resistivity, the effective carrier lifetime, the Cz defect formation and the resulting solar cell parameters of cells processed in an industrial standard screenprinting process. We find that the compensated material is dominantly influenced by the intrinsic metastable Cz defect which is proportional to the net-doping concentration. It is demonstrated that at least up to a mix-in ratio of 33% there are no feedstock-dependent performance losses. There is potential for higher mix-in ratio for this feedstock by lowering the net acceptor dopant concentration.