Question
Explain the mechanism of reverse biased p-n junction.
✓
Answer
i. In reverse biased, 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 potential barrier is thus increased.
ii. Also, the negative charge carriers (electrons) from the n-region are pulled away from the junction.
iii. Similar effect is experienced by the positive charge carriers (holes) in the p-region and they are pulled away from the junction.
iv. Both the charge carriers thus find it very difficult to cross over the barrier and thus do not contribute towards the electric current.
ii. Also, the negative charge carriers (electrons) from the n-region are pulled away from the junction.
iii. Similar effect is experienced by the positive charge carriers (holes) in the p-region and they are pulled away from the junction.
iv. Both the charge carriers thus find it very difficult to cross over the barrier and thus do not contribute towards the electric current.
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