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Title: Method for producing high purity Si for solar cells

Abstract

Highly purified starting materials for the production of silicon suitable for fabrication of solar cells are produced via the carbo-thermal reduction process. A carbon-containing material with impurities therein, either by itself or admixed with glass bodies, which are attained from a melt of quartz sand and glass-forming additives formed into a fiber form and pulverized, is converted into a granulate form with the aid of a bonding agent. The resultant granulates are contacted with a hot inorganic acid, such as 3N HC1 at about 90/sup 0/ C, to extract substantially all impurities from the granulates, which can be in pellet or tablet form. The resultant purified pellets are then directly charged into an electrical arc furnace to yield solar-quality silicon. With this process, highly purified SiO/sub 2/ and highly purified carbon are produced in a simple and cheap manner. The impurity level for boron, phosphorus and transition metal in these starting materials is less than about 10 ppm.

Inventors:
; ; ;
Publication Date:
OSTI Identifier:
6156020
Patent Number(s):
US 4460556
Assignee:
Siemes Aktiengesellschaft (Germany, Federal Republic of) EDB-85-011373
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 20 Apr 1983, Germany, Federal Republic of (F.R. Germany); Other Information: PAT-APPL-486685
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; SILICON; CHEMICAL PREPARATION; SILICON SOLAR CELLS; FABRICATION; ARC FURNACES; CARBON; GLASS; IMPURITIES; INORGANIC ACIDS; QUARTZ; REDUCTION; CHALCOGENIDES; CHEMICAL REACTIONS; DIRECT ENERGY CONVERTERS; ELECTRIC FURNACES; ELEMENTS; EQUIPMENT; FURNACES; HYDROGEN COMPOUNDS; MINERALS; NONMETALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PHOTOELECTRIC CELLS; PHOTOVOLTAIC CELLS; SEMIMETALS; SILICON COMPOUNDS; SILICON OXIDES; SOLAR CELLS; SOLAR EQUIPMENT; SYNTHESIS; 140501* - Solar Energy Conversion- Photovoltaic Conversion

Citation Formats

Aulich, H., Eisenrith, K.H., Schulze, F.W., and Urbach, H.P. Method for producing high purity Si for solar cells. United States: N. p., 1984. Web.
Aulich, H., Eisenrith, K.H., Schulze, F.W., & Urbach, H.P. Method for producing high purity Si for solar cells. United States.
Aulich, H., Eisenrith, K.H., Schulze, F.W., and Urbach, H.P. Tue . "Method for producing high purity Si for solar cells". United States.
@article{osti_6156020,
title = {Method for producing high purity Si for solar cells},
author = {Aulich, H. and Eisenrith, K.H. and Schulze, F.W. and Urbach, H.P.},
abstractNote = {Highly purified starting materials for the production of silicon suitable for fabrication of solar cells are produced via the carbo-thermal reduction process. A carbon-containing material with impurities therein, either by itself or admixed with glass bodies, which are attained from a melt of quartz sand and glass-forming additives formed into a fiber form and pulverized, is converted into a granulate form with the aid of a bonding agent. The resultant granulates are contacted with a hot inorganic acid, such as 3N HC1 at about 90/sup 0/ C, to extract substantially all impurities from the granulates, which can be in pellet or tablet form. The resultant purified pellets are then directly charged into an electrical arc furnace to yield solar-quality silicon. With this process, highly purified SiO/sub 2/ and highly purified carbon are produced in a simple and cheap manner. The impurity level for boron, phosphorus and transition metal in these starting materials is less than about 10 ppm.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {7}
}