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Three color infrared detector using InAs/GaSb superlattices with unipolar barriers
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View: Figures


Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(a) Heterostructure schematic of the three color nBn–NbIP detector. (b) X-ray diffraction scan and characterization of features associated to the various superlattices.

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

Dark current densities from top to middle contact (SWIR/MWIR response) and bottom to middle contact (LWIR response), at 80 K.

Image of FIG. 5.
FIG. 5.

Responsivity, measured , and calculated for SWIR and MWIR absorber regions (a), and LWIR absorber region (b).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Three color infrared detector using InAs/GaSb superlattices with unipolar barriers