Reduction in dark current using resonant tunneling barrier in dots-in-a-well long wavelength infrared photodetectors

Reduction of dark current in DWELL photodetectors using resonant tunneling barriers is presented. At 77 K, the dark current is reduced by a factor of 1000 in positive bias. The peak detectivity is 4 times 10
⁹
cm.Hz
^1/2
W
^-1
(V
_b
= -1.1 V, 77 K at lambda
_peak
= 11 mum).