![]() Some of the generated carriers may be lost, i.e., not contribute to the photocurrent that can be quantified with an internal quantum efficiency. In many cases, one obtains at most one photoelectron per absorbed photon. There are also metal–semiconductor–metal photodetectors, where a Schottky junction is used. In semiconductor-based detectors, one uses the internal photoelectric effect, most often in a p–n or p–i–n junction.In vacuum tube photodetectors such as phototubes and photomultipliers, one exploits the external photoelectric effect. ![]() That can involve somewhat different physical mechanisms: photodiodes, phototransistors, phototubes and photomultipliers – are based on the generation of a photocurrent, i.e., a current which arises in conjunction with the absorption of light. How to cite the article suggest additional literature Encyclopedia > letter P > photocurrent Photocurrentĭefinition: an electric current which is induced by incident light in a photodetector
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