TITLE

Observation of metal precipitates at prebreakdown sites in multicrystalline silicon solar cells

AUTHOR(S)
Kwapil, Wolfram; Gundel, Paul; Schubert, Martin C.; Heinz, Friedemann D.; Warta, Wilhelm; Weber, Eicke R.; Goetzberger, Adolf; Martinez-Criado, Gema
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p232113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The local prebreakdown behavior of a damage etched multicrystalline silicon solar cell produced from virgin grade feedstock was characterized. At the position of micrometer-scaled prebreakdown sites, which correlate with recombination active defects found along grain boundaries, micro-x-ray fluorescence mappings revealed the presence of Fe precipitate colonies. These measurements represent direct evidence that transition metal clusters lead to decreased breakdown voltage and cause soft diode breakdown.
ACCESSION #
46708329

 

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