Why is the base of a transistor lightly doped?
Question: Why is the base of a transistor lightly doped?
The base of a transistor is lightly doped primarily because it serves to allow an easy flow of current when an electric field is applied across it. The lighter the doping, the easier it is for charges to move through the base, allowing for a more easily controlled current. The base must be lightly doped to form a p-n junction (which is a junction between two oppositely doped regions) so that current in the form of holes can move easily between the collector and the emitter. Light doping is also important to ensure that the depletion layer formed at the base is wide enough so that enough current can pass through it.
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