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ECN publication
mc-Si: Relation between ingot quality and cell efficiency
Published by: Publication date:
ECN Solar Energy 1-9-2002
ECN report number: Document type:
ECN-RX--02-041 Conference Paper
Number of pages: Full text:
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Presented at: 12th Workshop on Crystalline Silicon Solar Cell Materials and Processes, Breckenridge CO, USA, 11-14 augustus 2002.

Material properties and solar cells of several common multicrystallineingots have been investigated and compared. Apart from the contaminated end parts of the ingots the cell quality correlates well with the as-received lifetime, and the lifetime profile through the ingot correlates with the distribution of defect densities in the material. The as-received lifetime after light soaking is a reasonable predictive parameter for cell performance for the complete ingot if the major impurity in the end parts is iron, and if the oxygen concentration is low. A high oxygen concentration of 15-20 ppma in the bottom parts of some ingots, instead of the more common 5-10 ppma for that position, correlates with a strong reduction of cell efficiency.

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