Question

Describe photo diode .

Answer 1

A photodiode is one type of light detector, used to convert the light into current or voltage based on the mode of operation of the device.

Answer 2

Hey there!


Answer:

A photodiode is basically a p - n junction diode, with the difference that is made from a light sensitive semiconductor material and it's is always operated I reverse bias. Further, current flowing through a photodiode is due to minority current, which depends on the magnitude of reverse bias as well as the intensity of the incident light. A photodiode is represented by the symbol of Shown in the attachment.

When a photodiode is reverse biased a very small reverse current flows through it, as it does in case of ordinary p - n junction diode. It is called the$\textbf{ dark current}$.


When light is incident on the junction of the diode, the width of the depletion layer increases and the electrons in the covalent bonds of the crystal structure gets stimulated. If the energy of the incident light is greater than the forbidden gap of the semiconductor material of the photodiode, it absorbed by the semiconductor.

$\textbf{Uses}$:


1) Photodiodes are used in reading film sounds track.

2) Photodiodes are used in smoke detectors.

3) Photodiodes are used in the recievers for the Infra red remote control devices used to control equipments, such that televisions, air conditioners etc.

4) Photodiodes are used in light operating switches.

5) Photodiodes are used in light detecting circuits.


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