Explain with the help of diagram, how a depletion layer and barrier potential are formed in a junction diode.

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Solution

the formation of pn junction, the holes from p-region diffuse into the M-region and electrons from n-region diffuse into p-region and electron hole pair combine and get annihilated. This in turn, produces potential barrier VB across the junction which opposes the further diffusion through the junction. Thus, small region forms in the vicinity of i the junction which is depleted of free charge carrier and has only immobile ions is called the depletion regions.

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Q. In a forward biased p- n junction diode, the potential barrier in the depletion region is of the form:

Q. If a

p - n

junction diode of depletion layer width

W

and barrier height

V_{0}

is forward biased, then

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(ii) Draw the circuit diagram of a half wave rectifier and explain its working.

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