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    Question

    Which statement is FALSE regarding Zener

    diode?
    A Zener diode is highly doped diode. Correct Answer Incorrect Answer
    B The probability of tunnelling increases as depletion layer is increased. Correct Answer Incorrect Answer
    C Zener diode is used in application of voltage regulation. Correct Answer Incorrect Answer
    D The breakdown in Zener diode is due to tunnelling Correct Answer Incorrect Answer

    Solution

    The false statement is: “The probability of tunnelling increases as depletion layer is increased.” In reality, the tunnelling probability increases when the depletion layer is thin , which happens if the diode is heavily doped . A thin depletion region allows electrons to tunnel through the potential barrier at relatively low reverse voltages, causing Zener breakdown. ●      Zener diode is indeed a highly doped diode (true). ●      Zener diodes are widely used for voltage regulation because they maintain a nearly constant voltage in breakdown (true). ●      The breakdown in a Zener diode occurs due to tunnelling of electrons through a narrow depletion region (true).

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