Question
Which statement is FALSE regarding Zener
diode?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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