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(a) Calculated equilibrium band diagram showing CB and VB at 77 K in the nBn–NbIP heterostructure. The electric field profile across the device for no externally applied bias is also shown. The position of the superlattice was obtained using a SEPM, while the bandstructure was calculated using Sentauraus TCAD simulator.
(a) Heterostructure schematic of the three color nBn–NbIP detector. (b) X-ray diffraction scan and characterization of features associated to the various superlattices.
Spectral response of SWIR, MWIR, and LWIR absorber regions at 77 K. The inset shows the LWIR absorber’s response from 8 to (since a LWIR band pass filter was used for the calibrated radiometry measurements).
Dark current densities from top to middle contact (SWIR/MWIR response) and bottom to middle contact (LWIR response), at 80 K.
Responsivity, measured , and calculated for SWIR and MWIR absorber regions (a), and LWIR absorber region (b).
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