e/Single-photon avalanche diode

Information
has gloss	eng: In optoelectronics the term Single-Photon Avalanche Diode (SPAD) (also known as a Geiger-mode APD or G-APD) identifies a class of solid-state photodetectors based on a reverse biased p-n junction in which a photo-generated carrier can trigger an avalanche current due to the impact ionization mechanism. This device is able to detect low intensity signals (down to the single photon) and to signal the arrival times of the photons with a jitter of a few tens of picoseconds.
lexicalization	eng: Single photon avalanche diode
lexicalization	eng: Single-Photon Avalanche Diode
instance of	c/Optical diodes

Media
media:img	SPAD Cross-section.gif
media:img	Spad-apd-characteristic-comparison.svg