DEVELOPMENT OF CLEARING TECHNIQUE OF METALLURGICAL SILICON TO SOLAR GRADE SILICON
https://doi.org/10.17073/1609-3577-2015-3-189-194
Abstract
Experimental results demonstrating the possibility of obtaining solar grade silicon by recrystallization of metallurgical silicon in fusible metals, e.g. tin, and pulling of single crystal silicon ingot obtained from silicon scales by the Czochralski method have been presented. Experiments for the purification of a fusible metal (tin) after the end of a cycle of silicon scales obtaining for the purpose of its reuse have been carried out. We purified tin by vacuum decontamination of tin melt, its filtration and finally zone recrystallization. Qualitative and quantitative analysis of the initial materials (silicon and tin) and their structure after sequential stages of the technological process has been carried out by X−ray fluorescent analysis on an Elvax light device. The structural features of the silicon scales have been examined using scanning electron microscopy on a REMMA106I device. The conductivity type and the electrical resistivity of the obtained single crystal silicon ingot have been measured using the four−probe method on a PIUS−1UM−K device. We show that the composition of the pulled single crystal ingot is not worse than 99.999 wt.% Si, it has the n type of conductivity and its electrical resistivity is not less than 2.0 Оhm•сm. These parameters meet the requirements to solar grade silicon and confirm the possibility of its obtaining from metallurgical silicon by recrystallization in fusible metals, e.g. tin.
Supporting agencies: Ministry of Education and Science
About the Authors
I. I. Maronchuk
Sevastopol State University, Sevastopol
Russian Federation
Russian Federation
Igor I. Maronchuk — Cand. Sci. (Eng.), Head of the Research Laboratory of Applied Physics and Nanotechnology in Energy
I. E. Maronchuk
Sevastopol State University, Sevastopol
Russian Federation
Russian Federation
Igor E. Maronchuk — Dr. Sci. (Eng.), Professor, Chief Researcher
D. D. Sanikovich
Sevastopol State University, Sevastopol
Russian Federation
Russian Federation
Daria D. Sanikovich — Researcher
I. B. Shirokov
Sevastopol State University, Sevastopol
Russian Federation
Russian Federation
Igor B. Shirokov — Dr. Sci. (Eng.), Professor, Head of the Department of Electronic Technology
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Review
For citations:
Maronchuk I.I., Maronchuk I.E., Sanikovich D.D., Shirokov I.B. DEVELOPMENT OF CLEARING TECHNIQUE OF METALLURGICAL SILICON TO SOLAR GRADE SILICON. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2015;18(3):189-194. (In Russ.) https://doi.org/10.17073/1609-3577-2015-3-189-194
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