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NEET PHYSICSEasy

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

A

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

B

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

C

The base region must be very thin and lightly doped.

D

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

Step-by-Step Solution

In a Bipolar Junction Transistor (BJT), the three regions have different sizes and doping concentrations to ensure proper functioning:

  1. Emitter: Heavily doped (to inject a large number of charge carriers) and moderate in size.
  2. Base: Very thin and lightly doped (so that very few majority charge carriers recombine here, allowing most to pass through to the collector).
  3. Collector: Moderately doped and largest in size (to efficiently collect charge carriers and dissipate heat). Additionally, for normal transistor action (active region), the emitter-base junction is forward-biased, and the collector-base junction is reverse-biased.
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