# Answer in detail. Discuss the effect of external voltage on the width of depletion region of a p-n junction. - Physics

Discuss the effect of external voltage on the width of depletion region of a p-n junction.

#### Solution

1. A p-n junction can be connected to an external voltage supply in two possible ways.
2. A p-n junction is said to be connected in a forward bias when the p-region connected to the positive terminal and the n-region is connected to the negative terminal of an external voltage source.
3. In forward bias connection, the external voltage effectively opposes the built-in potential of the junction. The width of the depletion region is thus reduced.
4. The second possibility of connecting the p-n junction is in a reverse-biased electric circuit.
5. In reverse bias connection, the p-region is connected to the negative terminal and the n-region is connected to the positive terminal of the external voltage source. This external voltage effectively adds to the built-in potential of the junction. The width of the potential barrier is thus increased.
Concept: p-n Junction
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#### APPEARS IN

Balbharati Physics 11th Standard Maharashtra State Board
Chapter 14 Semiconductors
Exercises | Q 3. (v) | Page 256