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Journal of the Electrochemical Society, Vol.156, No.9, H711-H715, 2009
Distribution of Light Elements in Multicrystalline Silicon for Solar Cells Grown by Directional Solidification
We investigated the relationship between the formation of small grains and the distribution of precipitates such as Si3N4 and SiON in a multicrystalline silicon ingot grown by the unidirectional solidification method. Si3N4 precipitates were mainly observed inside the small grain region, while SiON was mainly precipitated outside the small grain region. SiON started to precipitate before the formation of Si3N4 precipitates. Therefore, precipitation of SiON before precipitation of Si3N4 is a candidate in the formation of small grains.
Keywords:directional solidification;elemental semiconductors;ingots;precipitation;silicon;silicon compounds;solar cells