Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

Within a transistor,

Options

Aall three regions have identical impurity concentrations
Bthe emitter has the lowest impurity concentration
Cthe collector has the lowest impurity concentration
Dthe base has the lowest impurity concentration

Correct answer

D. the base has the lowest impurity concentration

Step-by-step solution

In a transistor, the three regions have different levels of doping. The emitter is heavily doped to inject a large number of charge carriers into the base. The base is very thin and lightly doped to minimize the recombination of charge carriers. The collector is moderately doped. Therefore, the base has the lowest impurity concentration.

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