Question

When arsenic is added as an impurity to silicon, the resulting
material is
(a) ????-type semiconductor
(b) p-type semiconductor
(c) ????-type conductor
(d) insulator

Answer 1

Answer:

When an intrinsic semiconductor such as silicon or germanium is doped with pentavalent element such as arsenic and phosphorus, it becomes n-type semiconductor.

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Answer 2

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 p-type semiconductor.

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