Question
Explain the mechanism of forward biased p-n junction.
✓
Answer
- In forward bias, a p-n junction is connected in an electric circuit such that the p-region is connected to the positive terminal and the n-region is connected to the negative terminal of an external voltage source.
- The external voltage effectively opposes the built-in potential of the junction. The width of potential barrier is thus reduced.
- Also, negative charge carriers (electrons) from the n-region are pushed towards the junction.
- A similar effect is experienced by positive charge carriers (holes) in the p-region and they are pushed towards the junction.
- Both the charge carriers thus find it easy to cross over the barrier and contribute towards the electric current.
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