Question

Drift current in the semiconductors depends upon
(A) only the electric field
(B) only the carrier concentration gradient
(C) both the electric field and the carrier concentration
(D) both the electric field and the carrier concentration gradient

Answer 1

Drift currently density in a material can be given by​

J=σE

=e(nμn+pμp)E

So, it depends both on electric field and carrier concentration.

Answer 2

Answer:

C

Explanation:

Drift current — This is the motion of a charged particle in response to an applied electric field.

When an electric field is applied across semiconductor carriers start moving hence produce a current.

The positively charged holes move with the electric field whereas the negatively charged electrons move against the electric field.

The motion of each of the carrier is described as constant drift.

Drift current depends on the electric field and the concentration of the carrier gradient.

The correct answer is C.