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Question: 4 a czochralski crystal is pulled from a melt containing...

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4. A Czochralski crystal is pulled from a melt containing 1016 cm3 boron and 2x1015 cm3 phosphorus. Initially the crystal will be P type but as it is pulled, more and more phosphorus will build up in the liquid because of segregation. At some point the crystal will become N type. Assuming ko 0.35 for phosphorus and 0.8 for boron, calculate the distance along the pulled crystal at which the transition from P to N type takes place. 3 marks)

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