The base of the transistor should be of:
Correct answer: B. Low doping
- A. High doping
- B. Low doping
- C. Zero doping
- D. None of these
Explanation
The base of a transistor is typically lightly doped compared to the emitter and collector regions.For an NPN transistor:- The emitter is heavily doped with an excess of donor impurities to provide a high concentration of majority carriers (electrons).- The base is lightly doped, allowing only a small number of minority carriers (holes in this case) to diffuse into the base region.- The collector is moderately doped and larger in size compared to the other regions to collect the majority carriers that transit through the base.Similarly, for a PNP transistor, the doping concentrations are reversed:- The emitter is heavily doped with an excess of acceptor impurities to provide a high concentration of majority carriers (holes).- The base is lightly doped, allowing only a small number of minority carriers (electrons in this case) to diffuse into the base region.- The collector is moderately doped and larger in size compared to the other regions to collect the majority carriers that transit through the base.This doping profile is crucial for the proper operation of the transistor and for controlling the flow of current through it.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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