Question

distinguish between drift and diffusion current​

Answer 1

Answer:

i) Diffusion current = the movement caused by variation in the carrier concentration. Drift current = the movement caused by electric fields.

ii)

Direction of the diffusion current depends on the slope of the carrier concentration. Direction of the drift current is always in the direction of the electric field.

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Answer 2

Answer:

Drift Current

(i) The movement of charge carriers is because of the applied electric field is known as drift current.

(ii)It requires electrical energy for the process of drift current.

(iii)This current obeys Ohm’s Law.

(iv)The direction of charge carriers in the semiconductor is reverse to each other.

(v)The direction of the drift current, as well as the electric field, will be the same.

(vi) It is dependent of permittivity

(vii)The direction of this current mainly depends on the polarity of the applied electric field.

Diffusion current

(i)The diffusion current can be occurred because of the diffusion in charge carriers.

(ii)Some amount of external energy is enough for the process of diffusion current.

(iii)This current obeys Fick’s Law.

(iv)For charge carriers, the densities of diffusion are reverse in symbol to each other.

(v)The direction of this current can be decided by the concentration of the carrier slope.

(vi)It is independent of permittivity

(vii)The direction of this current mainly depends on the charge within the concentrations of carrier