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High performance multicrystalline silicon: Grain structure and iron precipitation

: Autruffe, Antoine; M'hamdi, Mohammed; Schindler, Florian; Heinz, Friedemann D.; Ekstrøm, Kai Erik; Schubert, Martin C.; Sabatino, Marisa di; Stokkan, Gaute

Volltext urn:nbn:de:0011-n-4706170 (1.5 MByte PDF)
MD5 Fingerprint: 5a3b28557c7f533afd87b5944e3677a7
Copyright AIP
Erstellt am: 21.11.2018

Journal of applied physics 122 (2017), Nr.13, Art. 135103, 10 S.
ISSN: 0021-8979
ISSN: 1089-7550
European Commission EC
FP7-Infrastructures; 262533; SOPHIA
PhotoVoltaic European Research Infrastructure
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Photovoltaik; Silicium-Photovoltaik; Charakterisierung von Prozess- und Silicium-Materialien

A study of the spatial occurrence of iron precipitation in a high performance multicrystalline silicon (HPMC-Si) sample is presented. The separated effects of grain-boundaries, sparse intra-granular dislocations, and dislocation clusters are investigated by combining the Fei imaging method with glow discharge mass spectroscopy, electron backscatter diffraction, and two iron precipitation models. While the area-averaged precipitation at grain boundaries is relatively minor, almost the whole iron precipitation occurs within the grains, despite the very low intra-granular dislocation density. The fraction of non-precipitated iron in the studied HPMC-Si material was found to be one to two orders of magnitude higher than that reported previously for standard materials.