What are Drift and Diffusion currents?

Answer Posted / sudhanshu

Drift current depends on the electric field applied: if
there's no electric field, there's no drift current.

Diffusion current occurs even though there isn't an
electric field applied to the semiconductor. It does not
have E as one of its parameters. The constants it does
depend on are Dp and Dn, and +q and -q, for holes and
electrons respectively.

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