What is transistor? Its function and working?

The three different layers of a transistor are made of a different semiconductor material. Two out of three are doped in to give n-type or p-type, and one remaining layer is opposite of the other two layers. The layers are arranged in such a way that two similar layer sandwich the layer of opposite type. This gives two types of arrangement of layers in transistors namely P-N-P type and N-P-N type.

Also Read: PN Junction Diode Construction Working And Uses

The names for these three different layers are given below-

  • Emitter: It emits the charge carriers.
  • Collector: It collects the charge carriers.
  • Base: it is the region between emitter and collector.

In PNP transistors the sequence of doped regions is-

  • p-region collector
  • n-region base
  • p-region emitter


In NPN transistor the sequence of doped regions is-

  • n-region collector
  • p-region base
  • n-region emitter


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