We report our recent developments of antimonide based infrared photodetectors utilizing a complementary barrier infrared detector ( CBIRD ) design . The new generation of devices can operate close to zero bias with the same quantum efficiency as the initial design . 320x256 pixel long - wavelength infrared focal plane arrays utilizing optimized design have been demonstrated with 8.8 µm cutoff wavelength and noise equivalent differential temperature of 26 mK at operating temperature of 80 K for 300 K background and f/2 optics . As CBIRD detectors became valuable candidates for space - based instruments , question of their radiation tolerance became important . Here , we report our investigations of the proton irradiation effects on the photodetector performance .