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Why base is thinner compared to emitter and collector in a transistor?
The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base. The base region in a transistor is doped lightly so that the number density of majority carriers (electrons in p-n and holes in n-p-n transistor) is low. …
Why thickness of base is smaller than emitter and collector?
Because of this reason base is lightly doped. Thus, more current passing to the collector side or an output side. Also, we know only 5 % of emitter current transfer to base and 95 % current passing to the collector. The base region is lightly doped so that width of the base is less.
Which region is thinnest in BJT?
Role of Base Region of a BJT Transistor The base region of a BJT transistor is very thin and is lightly doped with current carriers. It is the region of a transistor which has opposite polarity charge carriers from the emitter and the collector regions.
Why thickness of collector is maximum as compared to that of base and emitter?
Answer: The collector region is the largest of all regions because it must dissipate more heat than the emitter or base regions. The larger area ensures that it has more surface area to dissipate heat.
Which is more doped base or collector?
The doping level of collector is intermediate between the heavy doping of emitter and the light doping of the base. The collector is so named because it collects electrons from base. The collector is the largest of the three regions; it must dissipate more heat than the emitter or base.
What is the thickness of a transistor?
BJT thickness 1 micron of base region; emitter more doped than collector; AZ: electrons moving across E-B junction can diffuse across base to collector and then move up; a few holes go the opposite direction.
What is the use of base in BJT?
A bipolar junction transistor (BJT) has three terminals, called base, collector, and emitter. The BJT exhibits a tremendously useful property: a small current flowing into the base causes a much larger current to flow into the collector.
Why is emitter heavily doped?
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.
Which is more doped collector or base?
In most transistors, emitter is heavily doped. Its job is to emit or inject electrons into the base. The collector is so named because it collects electrons from base. The collector is the largest of the three regions; it must dissipate more heat than the emitter or base.