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Explain with the help of a diagram, how ...

Explain with the help of a diagram, how a depletion layer and barrier potential are formed in a junction diode.

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Due to the diffusion of electrons and the holes, from their majority zone to minority zone, a layer of positive and negative space charge region on either side on the junction is formed. This is called the depletion region. The loss of electrons, from n-region and gain of electrons by the p-region, causes a difference of potential across the junction. This tends to prevent the movement of charge carrier across the junction and is, therefore, termed as barrier potential.
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Knowledge Check

  • The width of the depletion region in a P-N junction diode is

    A
    increased by reverse bias
    B
    increased by forward bias
    C
    decreased by reverse bias
    D
    independent of the bias voltage

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