Why are n-type and p-type semiconductor electrically neutral?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

When a pentavalent impurity atom is added to a pure semiconductor to make it n-type semiconductor, it donates one free electron to the crystal, leaving a positive charge on the donor atom, the donated electron remains in the crystal in free state. As the charge on the donor ion is equal and opposite to the charge of the electron, the crystal itself remains electrically neutral. With the same reasoning, p-type semiconductor is also electrically neutral.

 

Answered by  | 4th Jun, 2014, 03:23: PM