What is the basic principle of photodetector?

The working principle of a photodiode is, when a photon of ample energy strikes the diode, it makes a couple of an electron-hole. This mechanism is also called the inner photoelectric effect.

What is a photodetector explain in detail?

Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. There is a wide variety of photodetectors which may be classified by mechanism of detection, such as photoelectric or photochemical effects, or by various performance metrics, such as spectral response.

What is photodiode principle of class 12?

Definition: A semiconductor (special type of p-n junction) device that converts light energy into electrical energy. When a light incident on the p-n junction diode, it creates electron-hole pairs that increase the conductivity in the circuit. Photodiodes are very sensitive to the incident light.

Is photodiode and photodetector same?

As nouns the difference between photodiode and photodetector is that photodiode is a semiconductor two-terminal component whose electrical characteristics are light-sensitive while photodetector is any device used to detect electromagnetic radiation.

What are the types of photodetector?

Common Types of Photodetectors

p-n Photodiodes.
p-i-n Photodiodes.
Avalanche Photodiodes.
MSM Photodetectors.

Is photodetector and photodiode same?

Where are the photodiodes located in a photo detector?

The photodetector contains three photodiodes, visible in the photo (in center). Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. A photo detector has a p–n junction that converts light photons into current. The absorbed photons make electron–hole pairs in the depletion region.

How is the current responsivity of a photodetector determined?

The current responsivity of the photodetector is determined by the quantum efficiency, η, and by the photoelectric gain, g. The quantum efficiency value describes how well the detector is coupled to the radiation to be detected. It is usually defined as the number of electron–hole pairs generated per incident photon.

How is a photodetector different from a photo detector?

A photodetector salvaged from a CD-ROM drive. The photodetector contains three photodiodes, visible in the photo (in center). Photodetectors, also called photosensors, are sensors of light or other electromagnetic radiation. A photo detector has a p–n junction that converts light photons into current.

How are phototransistors and photodiodes used in sensors?

Phototransistors, which act like amplifying photodiodes. Pinned photodiodes, a photodetector structure with low lag, low noise, high quantum efficiency, and low dark current, widely used in most CCD and CMOS image sensors. Quantum dot photoconductors or photodiodes, which can handle wavelengths in the visible and infrared spectral regions.