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The use of Silicon Wafer Barriers in the Electrochemical Reduction of Solid Silica to Form Silicon in Molten Salts
Date
2017-06-01
Author
Akpınar, Burcu
ERDOĞAN, MUSTAFA
Akduman, B.
Karakaya, İshak
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Nowadays, silicon is the most critical element in solar cells and/or solar chips. Silicon having 98 to 99% Si as being metallurgical grade, requires further refinement/purification processes such as zone refining [1,2] and/or Siemens process [3] to upgrade it for solar applications. A promising method, based on straightforward electrochemical reduction of oxides by FFC Cambridge Process [4], was adopted to form silicon from porous SiO2 pellets in molten CaCl2 and CaCl2-NaCl salt mixture [5]. It was reported that silicon powder contaminated by iron and nickel emanated from stainless steel cathode, consequently disqualified the product from solar applications. SiO2 pellets sintered at 1300oC for 4 hours, were placed in between pure silicon wafer plates to defeat the contamination problem. Encouraging results indicated a reliable alternative method of direct solar grade silicon production for expanding solar energy field.
Subject Keywords
General Engineering
URI
https://hdl.handle.net/11511/36003
DOI
https://doi.org/10.1149/07711.2011ecst
Collections
Department of Metallurgical and Materials Engineering, Conference / Seminar
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B. Akpınar, M. ERDOĞAN, B. Akduman, and İ. Karakaya, “The use of Silicon Wafer Barriers in the Electrochemical Reduction of Solid Silica to Form Silicon in Molten Salts,” 2017, vol. 77, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36003.