The incident quantum efficiency ηi(λ) and apparent noise input power (ANEP) were measured for two P-I-N photodiodes. Typical values at λ8000 Å are 0.68 × 10-15 W and 3.3 × 10-15 W, respectively. Several potential uses of this kind of detector for astronomical photometry and spectrometry are considered.
Richard Fisher, "P-I-N Diode Detectors for Astronomical Photometry," Appl. Opt. 7, 1079-1083 (1968)