Sv. Averin et al., FAST-RESPONSE PHOTODETECTORS WITH A LARGE ACTIVE AREA, BASED ON SCHOTTKY-BARRIER SEMICONDUCTOR STRUCTURES, Kvantovaa elektronika, 23(3), 1996, pp. 284-286
A two-dimensional model is used to investigate the characteristics of
the pulsed response and efficiency of metal-semiconductor-metal photod
iode structures made of GaAs. The active area of these structures is 4
00 x 400 mu m and the distance between the contacts is 10 mu m. An inc
rease in this distance ensures a sufficiently homogeneous distribution
of the electric field in the active region of the photodiode. The cap
acitance of the interdigital system of contacts, based on the Schottky
barrier, is considerably less than that of a pin photodetector of equ
al area and does not impose any restrictions on the characteristics of
the pulsed photodiode response. The calculated response time of this
photodiode structure (110 ps at half-amplitude) agrees with the experi
mental value.