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Get Answers to all your Questions
(a) Explain with the help of suitable diagram, the two processes which occur during the formations of a p-n junction diode. Hence define the terms (i) depletion region and (ii) potential barrier.
(b) Draw a circuit diagram of a p-n junction diode under forward bias and explain its working.
Answers (1)
(a) The two processes are
(i) Diffusion
(ii) Drift
Due to concentration gradient electrons diffusion takes from n to p and holes diffuses from p to n.
Due to the diffusion, an electric field is developed across the junction. Due to this electric field electron moves from p to n side and holes from n to p side. The current due to this flow of charge is known as drift current.
After some time the diffusion current equals the drift current and further flow of charge is stopped.
Depletion Region -
It is the space charge region on either side of the junction, which got depleted of free charges,
Potential barrier-
The potential difference developed across the junction and opposes the diffusion of charge and brings equilibrium condition is known as the potential barrier.
(b)
When the external voltage is increased the depletion region width decreases. At some particular voltage depletion region width reduces to zero and the charged particles start crossing the junction. Thus current flows and this current increases with increase in voltage.
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