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Binderless Consolidation of Fine Poly-Si Powders for the Application as Photovoltaic Feedstock  

Shin, Je-Sik (Production Technology R/D Div., Korea Institute of Industrial Technology)
Kim, Dae-Suk (Dept. of Materials Engineering, Korea University of Technology and Education)
Kim, Ki-Young (Dept. of Materials Engineering, Korea University of Technology and Education)
Shon, In-Jin (Div. of Advanced Materials Engineering, the Research Center of Industrial Technology, Cheonbuk National University)
Moon, Byung-Moon (Production Technology R/D Div., Korea Institute of Industrial Technology)
Publication Information
Resources Recycling / v.18, no.1, 2009 , pp. 38-43 More about this Journal
Abstract
In this study, binderless consolidation processes of ultra foe Si powder, by-products of making high purity poly-Si in the current method, were systematically investigated for use as economical solar-grade feedstock. The average diameter of the silicon powder was $7.8{\mu}m$. The main contaminants of the fine silicon powder were $SiO_2$ type oxide and humidity. The chemical pretreatment using the HF solution was observed to be effective for the improvement of the compactability of the silicon powder and the density ratio and the strength of the silicon powder compacts. The yield of the binder-free consolidation process increased by 20% under a vacuum condition. In as-received state, the silicon powder were not pure enough to be used as solar grade feed-stock material. After the dry chemical treatments, a sufficiently high purity above solar-grade was able to be achieved.
Keywords
poly-Si; fine powders; consolidation; melting; density ratio; strength; electrical resistivity;
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