Question

Why is the base of a transistor made 'very thin' compared to the other terminals of that transistor?

Answer 1

The base region is meant for “only the control” of the strong flow of charge carriers from the Emitter towards the Collector.
It is not supposed to absorb/emit any carriers on its own ideally.
That can be done by making the base extremely thin to see that the carriers won’t get enough time to recombine and also won’t get a chance to recombine, weakening the flow.

Answer 2

In most transistors, emitter is heavily doped. Its job is to emit or inject electrons into the base. These bases are lightly doped and very thin, it passes most of the emitter-injected electrons on to the collector. ... The collector is so named because it collects electrons from base.


I hope it helps you dear ☺️.....