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Describe briefly, with the help of a dia...

Describe briefly, with the help of a diagram, the role of the two important processes involved in the formation of a p-n junction.

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The two processes are :(i) Diffusion (ii) Drift Diffusion : Holes diffuse from p-side to n-side ( p `to `n) and electrons diffuse from n-side to p-side ( n`to`p). Drift: The motion of charge carriers, due to the applied electric field (`vecE`) which results in drifting of holes along `vecE` and of electrons opposite to that of electric field (`vecE`).
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