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What is the level of doping in Zener Diode?

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What is the level of doping in Zener Diode?

(a) Lightly Doped

(b) Heavily Doped

(c) Moderately Doped

(d) No doping

I had been asked this question in unit test.

This key question is from Zenner Diode topic in section Semiconductors of Engineering Physics II

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Correct choice is (b) Heavily Doped

Easy explanation: A Zener diode is heavily doped so that the breakdown voltage occurs at a lower voltage. If it were lightly/moderately doped, it would breakdown at a comparatively high voltage and, thus, would not be able to serve its purpose.

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