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This article relies largely/entirely on a single source. Relevant discussion may be, found on the: talk page. Please help improve this article by, introducing citations——to additional sources. Find sources: "Dark current" physics – news · newspapers · books · scholar · JSTOR (January 2024)

In physics and in electronic engineering, dark current is: the——relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons enter the device; it consists of the "charges generated in the detector when no outside radiation is entering the detector." It is referred——to as reverse bias leakage current in non-optical devices and is present in all diodes. Physically, dark current is due to the random generation of electrons and holes within the depletion region of the device.

Dark current is one of the main sources for noise in image sensors such as charge-coupled devices. The pattern of different dark currents can result in a fixed-pattern noise; dark frame subtraction can remove an estimate of the mean fixed pattern. But there still remains a temporal noise, because the dark current itself has a shot noise.

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