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Purification of low quality silicon feedstock [for solar cell fabrication]

: Einhaus, R.; Sarti, D.; Hässler, C.; Trassy, C.; Delannoy, Y.; Wolf, S. de; Ferrazza, F.; Martinuzzi, S.; Warta, W.

Fulltext urn:nbn:de:0011-n-2095184 (410 KByte PDF)
MD5 Fingerprint: 409aa4c1ba526b15b376d1d5445d56a7
Created on: 7.11.2012

IEEE Electron Devices Society:
Twenty-Eighth IEEE Photovoltaic Specialists Conference 2000. Conference record : Anchorage Hilton Hotel, Anchorage, AK, 15 -22 September 2000
Piscataway: IEEE Operations Center, 2000
ISBN: 0-7803-5772-8
ISBN: 0-7803-5773-6
ISBN: 0-7803-5774-4
Photovoltaic Specialists Conference <28, 2000, Anchorage/Alaska>
Conference Paper, Electronic Publication
Fraunhofer ISE ()

In the frame of the European ARTIST project, purification techniques have been developed that allow to use alternative silicon feedstock sources for PV production:
(i) very low resistivity (0.08-0.1 Omega cm) (VLR) silicon material was produced by directional solidification, resulting in solar cells of 14.5% efficiency;
(ii) an inductive plasma purification unit was developed, demonstrating a significant reduction of B, P, C, O, Ca, and Al impurities from upgraded metallurgical grade silicon;
(iii) an Sb evaporation/condensation process was established to allow heavily doped n-type silicon feedstock to be used for PV, resulting in an average reduction of Sb by a factor of more than 100 after evaporation and directional solidification and in solar cell efficiencies above 15.5%. This paper summarises the technical state-of-the-art that has been achieved to date with respect to the above mentioned techniques.