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Impact of iron and molybdenum in mono and multicrystalline float-zone silicon solar cells

: Coletti, G.; Geerligs, L.J.; Manshanden, P.; Swanson, C.; Riepe, S.; Warta, W.; Arumughan, J.; Kopecek, R.


Cavallini, A.:
Gettering and Defect Engineering in Semiconductor Technology XII, GADEST 2007 : Selected, peer reviewed papers from Gettering and Defect Engineering in Semiconductor Technology - GADEST 2007" held from 14th to 19th October 2007 in Italy at the EMFCSC
Clausthal-Zellerfeld: Trans Tech Publications, 2008 (Diffusion and defect data. B, Solid state phenomena 131-133)
ISBN: 3-908451-43-4
ISBN: 978-3-908451-43-3
International Autumn Meeting Gettering and Defect Engineering in Semiconductor Technology (GADEST) <12, 2007, Erice>
Fraunhofer ISE ()

This paper investigates the impact of iron (Fe) and molybdenum (Mo) when they are introduced in the feedstock for mono- and multicrystalline Float-Zone (FZ) silicon (Si) growth. Neutron Activation Analysis shows that the segregation coefficient is in agreement with literature values. Lifetime maps on monocrystalline wafers show a uniform lifetime which decreases with the increase of contamination levels. Multicrystalline wafers show low lifetime areas, corresponding to grain boundaries and highly dislocated areas, which are independent from the contamination levels. Intra grain areas have a higher lifetime which changes with the contamination levels. The solar cells show a reduced diffusion length in multicrystalline uncontaminated cells compare to the monocrystalline uncontaminated. In multicrystalline cells the lowest level of Fe introduced (1012 atm/cm3) has hardly any influence, whereas in the Mo-contaminated cells the impact is visible from the lowest level (1011 a tm/cm3). In monocrystalline cells the diffusion length is reduced already at the lowest contamination level of Fe.