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Effect of impurities on solar cell parameters in intentionally contaminated multicrystalline silicon

: Reis, I.E.; Riepe, S.; Koch, W.; Bauer, J.; Beljakowa, S.; Breitenstein, O.; Habenicht, H.; Kreßner-Kiel, D.; Pensl, G.; Schön, J.; Seifert, W.


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>
Fraunhofer ISE ()

Multicrystalline silicon blocks, intentionally contaminated with iron and copper, had been cast and characterized by the twelve German research institutes working together with twelve German companies in the network project SolarFocus. The results of the lifetime measurements, NAA, FTIR analysis, DLTS/MCTS investigations, determination and simulation of the Fei content, solar cell processing, shunt and microscopic investigations are presented in this paper. The combined analysis reveals the influence of the in-diffusion of metal impurities from the crucible as well as the back-diffusion from the top region of the block. Solar cell efficiency is influenced by multiple recombination active defects as well as shunts induced by a high metal contamination.