Transistor
Transistor is a semiconductor solid state device. used to amplify or switch electronic signal and electrical power. it consists of silicon or germanium crystal containing two PN junction. the two pn junction are formed between the three layers. these are called base, emitter and collector. |
| transistor |
1. Base(B) layer :-
It is a very thin layer, the thickness is about 25 microns it is a central region of the transistor.
2. Emitter(E) layer:-
The emitter region is heavily doped, since emitter has to supply majority carriers.
3. Collector(C) layer:-
The collector region is lightly doped. since it has to accept majority charge carriers, it is large in size hence emitter and collector can not be interchanged.
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