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Semiconductor Electronics: Materials, Devices and Simple Circuits
Question
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When p-n junction diode is forward biased

  • the depletion region is reduced and barrier height is increased

  • the depletion region is widened and barrier height is reduced.

  • both the depletion region and barrier height reducedboth the depletion region and barrier height reduced

  • both the depletion region and barrier height increased.

Answer

C.

both the depletion region and barrier height reducedboth the depletion region and barrier height reduced

When p-end of the p-n junction is connected to positive terminal of battery and n-end to the negative terminal of a battery, then p-n junction is said to be forward bias. In forward bias, the more numbers of electrons go from n-region to p-region and more numbers of holes go from p-region to n-region. Therefore, major current due to both types of carriers takes place through the junction causing a reduction in height of depletion region and barrier potential.

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