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Solar-Grade Silicon by Directional Solidification in Carbon Crucibles

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3 Author(s)
T. F. Ciszek ; Solar Energy Research Institute, Photovoltaics Branch, Golden, Colorado 80401, USA ; G. H. Schwuttke ; K. H. Yang

Directional solidification of silicon in carbon crucibles was achieved by using two variations of the Bridgman-Stockbarger method. One was a static technique wherein liquid silicon in a carbon crucible was positioned in a temperature gradient of about 35°C/cm, with the highest temperature at the top of the crucible. Solidification was achieved by lowering the system temperature at a rate of 4–5°C/min. The second technique entailed lowering a silicon-loaded carbon crucible through a fixed-rf coil at a rate of 0.55 cm/min. Crack-free silicon was produced by both methods. The equilibrium grain structure was initiated by nucleation at the crucible walls, with surviving grains tending to grow in alignment with the temperature gradient to produce an axially columnar grain structure of mainly 〈110〉 orientation. The average grain diameter was 0.11 cm; a typical length was 0.7 cm. Solar cells made with this material gave an AM1 conversion efficiency of 11.5%.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:23 ,  Issue: 3 )