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Topic: Semiconductors· Electronic Devices

For transistor action, which of the following statements is correct ?

1. Base, emitter and collector regions should have same doping concentrations.

2. Base, emitter and collector regions should have same size.

3. Both emitter junction as well as the collector junction are forward biased.

4. The base region must be very thin and lightly doped.

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Answer: 4. The base region must be very thin and lightly doped.

For transistor action the base must be very thin and lightly doped, so most carriers from the emitter cross the base to the collector instead of recombining.

  • The emitter is heavily doped, the collector moderately, the base lightly, so doping is not equal.
  • The collector is larger than the emitter, so sizes differ.
  • Emitter junction is forward biased and the collector junction reverse biased, not both forward.

Answer: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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