Phototransistors

Phototransistors are semiconductor devices, a type of bipolar transistors. They differ from classical devices in the availability of the base area for light emission, due to which it is possible to control the amplification of electrical signals using optical radiation.

Phototransistors can be of PNP or NPN structure and can amplify the electrical current at the output. In this case, electron-hole pairs produced by radiation are concentrated in the base, and electrons are concentrated in the collector or emitter, due to which the positive potential of the base increases.

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