GATE EC 2026 Set 1 — Question 14

MCQ+1 / -0.33EasyZener & Avalanche BreakdownP-N Junction & DiodesElectronic Devices

Electronic Devices → P-N Junction & Diodes → Zener & Avalanche Breakdown

Last updated 5 September 2026

Question

Consider carrier transport in a Zener diode in the breakdown region. Which is the dominant transport mechanism for current flow in this case?

Correct answer (C) Tunneling Solution In a Zener diode, when it is operated in the breakdown region, the dominant mechanism for current flow is Zener breakdown, which is a quantum mechanical tunneling phenomenon. This occurs when a high electric field across the p-n junction causes electrons to tunnel from the valence band to the conduction band, leading to a sudden increase in reverse current. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (C) Tunneling Solution In a Zener diode, when it is operated in the breakdown region, the dominant mechanism for current flow is Zener breakdown, which is a quantum mechanical tunneling phenomenon. This occurs when a high electric field across the p-n junction causes electrons to tunnel from the valence band to the conduction band, leading to a sudden increase in reverse current.

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