In a BJT, which of the following layers is heavily doped?(a) Collector(b) Emitter(c) Base(d) ElectronThe question was asked in an interview.My query is from BJT Construction and Operation topic in division BJT Biasing of Analog Circuits

In a BJT, which of the following layers is heavily doped?(a) Collector

1.	In a BJT, which of the following layers is heavily doped?(a) Collector(b) Emitter(c) Base(d) ElectronThe question was asked in an interview.My query is from BJT Construction and Operation topic in division BJT Biasing of Analog Circuits
Answer» Right answer is (b) Emitter The best I can explain: The emitter is the most heavily doped and contains the maximum AMOUNT of CHARGE carriers. It is the emitter’s TASK to inject carriers into the base. These bases are thin and LIGHTLY doped. For npn B JT, emitter injects electrons, and for pnp, it injects HOLES.

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