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Upgraded metallurgical silicon for application in the photovoltaic industry

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Upgraded metallurgical silicon for application in the photovoltaic industry (Volume 5)

Samo Semenic (Author)

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ISBN-13 (Printausgabe) 3954040085
ISBN-13 (Hard Copy) 9783954040087
ISBN-13 (eBook) 9783736940086
Language English
Page Number 168
Lamination of Cover matt
Edition 1 Aufl.
Book Series Schriftenreihe des Lehrstuhls für Kontinuumsmechanik und Materialtheorie der Technischen Universität Berlin
Volume 5
Publication Place Göttingen
Place of Dissertation Berlin
Publication Date 2012-02-08
General Categorization Dissertation
Departments Mining and metallurgy
Keywords Metallkunde; Directional solidification; Refining; Heat Exchanger method; Solar grade silicon; Metallurgical grade silicon; Photovoltaics; upgraded metallurgical silicon
Description

The work is focused on the purification of metallurgical grade silicon into solar grade silicon. For the purpose of a cost effective production many well-known processes were theoretically and experimentally evaluated: reduction of silicon dioxide with carbon, reduction of boron with slag treatment, treatment with oxidative gas treatment (with a plasma torch and by gas flushing into the liquid silicon). Reduction of phosphorus was evaluated under vacuum in an induction furnace and with the electron beam technology. Reduction of other impurities we followed by controlled crystal growth and the segregation effect. Manufacturing of small quantities of silicon in an arc furnace using ultra-pure quartz and carbon in order to prove the producibility in principle were done. Most of the experiments have been carried out with commercially available metallurgical grade silicon produced for the aluminum industry. Material was manufactured by applying various technologies and using several experimental devices. From such material solar cells, showing 16 % efficiency, have been fabricated by an established cell manufacturer.