Discussion
Why is a transistor's base lightly doped compared with its emitter?
Answer: B
Light base doping means few majority carriers there to recombine with the injected ones, so the emitter injection efficiency is high and almost all the emitter current becomes collector current. The raised bulk resistance is an unwanted consequence rather than the aim, and the two remaining effects are undesirable. Doping asymmetry is what makes the emitter inject far more than the base does back into it, and that asymmetry is why the device is not symmetrical.
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