To get n-type doped semiconductor, the impurity to be added to silicon should have the following number of valence electrons ?

Options

A. 5
B. 2
C. 1
D. 3

Answer

A

Explanation

When a pure semiconductor of Ge or Si is doped with a controlled amount of pentavalent atoms, say arsenic or phosphorus or antimony or bismuth, it is called N-type semiconductor because the conduction of electricity in such semiconductor is due to motion of electrons i.e., negative charges.