ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
This paper investigates the impact of iron (Fe) and molybdenum (Mo) when they areintroduced 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 literaturevalues. Lifetime maps on monocrystalline wafers show a uniform lifetime which decreases with theincrease of contamination levels. Multicrystalline wafers show low lifetime areas, corresponding tograin 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 cellsshow a reduced diffusion length in multicrystalline uncontaminated cells compare to themonocrystalline uncontaminated. In multicrystalline cells the lowest level of Fe introduced (1012atm/cm3) has hardly any influence, whereas in the Mo-contaminated cells the impact is visible fromthe lowest level (1011 atm/cm3). In monocrystalline cells the diffusion length is reduced already atthe lowest contamination level of Fe
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.131-133.15.pdf
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