What is the difference between Photodiode and phototransistor?

One of the major differences between the photodiode and the phototransistor is that the photodiode uses a PN junction diode that converts the light energy into electrical current while the phototransistor uses the ordinary transistor (NPN transistor) to convert light into electricity.

One of the major differences between the photodiode and the phototransistor is that the photodiode uses a PN junction diode that converts the light energy into electrical current while the phototransistor uses the ordinary transistor (NPN transistor) to convert light into electricity.

Major Difference between Photodiode and Phototransistor:-

  • The phototransistor generates power while the photodiode generates both voltage and current.
  • The response of the photodiode is much faster than the phototransistor.
  • The photodiode is a semiconductor device that converts the energy of light into electricity. While the phototransistor uses the transistor to convert light energy into electricity.
  • The photodiode is less sensitive than the phototransistor because the phototransistor generates the large output current.
  • The photodiode is used in solar power plants, in a photometer, etc., while the phototransistor is used to detect the light.
  • The photodiode operates in both the forward and reverse directions while the phototransistor operates in the forward direction.
  • The emitter of the phototransistor is negative compared to the collector region.

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