PIN diode
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A PIN diode (p-type, intrinsic, n-type diode) is a photodiode with a large, neutrally doped intrinsic region sandwiched between p-doped and n-doped semiconducting regions.
A PIN diode exhibits an increase in its electrical conductivity as a function of the intensity, wavelength, and modulation rate of the incident radiation.
Source: from Federal Standard 1037C
The idea behind PIN diode is that the depletion region width is constant (or almost constant) regardless of the reverse bias applied to the diode. For this reason many devices include at least one PIN diode in their construction, e.g. PIN photodetectors and bipolar transistors (at which base-collector junction is a PIN diode).de:PIN-Diode fr:Diode PIN