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Question

A Zener diode has a contact potential of 1.5 V in the absence of biasing. It undergoes Zener breakdown for an electric field of 106 V/m at the depletion region of p−n junction. If the width of the depletion region is 2.5 μm, ______ be the reverse biased potential (in V) for the Zener breakdown to occur.

A
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B
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C
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D
3
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Solution

The correct option is A 1Given: E=106 V/m width of the depletion region, d=2.5 μm=2.5×10−6 m Now, breakdown potential, V=Ed=106×2.5×10−6=2.5 V So, the reverse biased potential for breakdown, VZ=V−Vcontact potential =2.5−1.5=1 V Hence, option (A) is the correct answer.

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