Difference between Photodiode and Photomultiplier | Photodiode Vs Photomultiplier
It consists of a normal p-n junction housed in a small enclosure which a transparent window through which light can fall inside. Figure-1 depicts photodiode from OSRAM and symbol of photodiode. Photodiode is basically a type of photodetector capable of converting light into either current or voltage.
A photo diode is operated in reverse bias in which leakage current increases in proportion to the amount of light falling on the junction. This is result of light energy which breaks the bonds in the crystal lattice of the semiconductor producing electrons and holes. This effect is similar to photo voltaic cell.
The major difference between photodiode and photomultiplier tube.
->Photodiode convert one photon into one electron, while photomultiplier amplify electrons. Photomultiplier tube uses detector which changes photons into electrons so that they can be detected. Later photomultiplier tube uses dynodes to amplify the electrons.
Source: RF Wireless World (https://www.rfwireless-world.com/)
Depending on the models, Techcomp UV-VIS Spectrophotometers are using both PMT and photodiode as detectors.
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