PT Journal
AU Smirnov, K
   Divochiy, A
   Vakhtomin, Y
   Morozov, P
   Zolotov, P
   Antipov, A
   Seleznev, V
TI NbN single-photon detectors with saturated dependence of quantum efficiency
SO Supercond. Sci. Technol.
JI Supercond. Sci. Technol.
PY 2018
BP 035011 (1 to 8)
VL 31
IS 3
DI 10.1088/1361-6668/aaa7aa
DE NbN SSPD; SNSPD
AB The possibility of creating NbN superconducting single-photon detectors with saturated dependence of quantum efficiency (QE) versus normalized bias current was investigated. It was shown that the saturation increases for the detectors based on finer films with a lower value of Rs300/Rs20. The decreasing of Rs300/Rs20 was related to the increasing influence of quantum corrections to conductivity of superconductors and, in turn, to the decrease of the electron diffusion coefficient. The best samples have a constant value of system QE 94% at Ib/Ic ~ 0.8 and wavelength 1310 nm.
ER