Question

The impurity commonly used for realizing the base region of a silicon npn - -
transistor is
(A) Gallium (B) Indium
(C) Boron (D) Phosphorus

Answer 1

(c) Boron Is The Answer.

Answer 2

The impurity commonly used for realizing the base region of a silicon npn transistor is (C) Boron

Bipolar transistors consist essentially of two mutually connected p-n junctions with the layer sequence n-p-n or p-n-p. The connections of the bipolar transistor are emitter (E), base (B) and collector (C). While emitter and collector have the same doping, the very thin base layer in-between is doped contrarily. With boron the p-doped base is introduced, a subsequent diffusion step magnifies its dimensions.