Fig. 4: Blackbody response of the bipolar-barrier tunnel heterostructures.
From: Bipolar-barrier tunnel heterostructures for high-sensitivity mid-wave infrared photodetection
a Schematic of the blackbody response measurement setup. b Blackbody radiation spectra at different temperatures, which were calculated according to the Planck’s law. An optical bandpass filter is used to allow light within the wavelength range of 3.5–4 μm to pass through. c Time-resolved blackbody response of the heterostructure at different radiation temperatures. d Blackbody responsivity as a function of switching frequency at the temperature of 1173 K. Insert shows the blackbody response time of 78/103 μs, indicating a –3dB bandwidth of 4.5 kHz (f-3dB = 0.35/τrising). e Responsivity and specific detectivity at different blackbody temperatures
