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  4. When arsenic is added as an impurity to silicon, the resulting material is

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Q. When arsenic is added as an impurity to silicon, the resulting material is

AIPMTAIPMT 1996Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Arsenic is pentavalent, therefore when added with silicon it leaves one electron as a free electron. In this case the conduction of electricity is due to motion of electrons, so the resulting material is n-type semiconductor.