what is drift current and diffusion current plz explain
Drift current :-
When charges(holes or electrons) move under external electric field to produce current is called drift current.
It is produced due minority carriers( holes in n–type move from right to left and electrons in P–type move from
left to right) under the external electric field developed in depletion layer.
Drift current is directed from N type to P type material.
Diffusion current.
The current that is observed when the excess holes diffuse to other side(N type) and the excess electrons diffuse to P type due carrier concentration is called diffusion current.
Diffusion current is directed from P type to N type material.
If there is no biasing drift current is equal to diffusion current.