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Independently Accessible Dual-band Barrier Infrared Detector using Type-II Superlattices
Version 1
: Received: 3 April 2024 / Approved: 5 April 2024 / Online: 5 April 2024 (12:43:13 CEST)
How to cite: Park, S.-M.; Grein, C. H. Independently Accessible Dual-band Barrier Infrared Detector using Type-II Superlattices. Preprints 2024, 2024040415. https://doi.org/10.20944/preprints202404.0415.v1 Park, S.-M.; Grein, C. H. Independently Accessible Dual-band Barrier Infrared Detector using Type-II Superlattices. Preprints 2024, 2024040415. https://doi.org/10.20944/preprints202404.0415.v1
Abstract
We report a novel dual-band barrier infrared detector (DBIRD) design using type-II superlattices (T2SLs). The DBIRD structure consists of back-to-back barrier diodes: a "blue channel" (BC) diode which has an nBp architecture, an n-type layer of larger bandgap for absorbing blue band infrared/barrier/p-type layer, and a "red channel" (RC) diode which has an pBn architecture, a p-type layer of smaller bandgap for absorbing red band infrared/barrier/n-type layer. Each has a unipolar barrier using a T2SL lattice matched to a GaSb substrate to impede the flow of majority carriers from the absorbing layer. Each channel in the DBIRD can be independently accessed with a low bias voltage, as is preferable for high-speed thermal imaging. Device modeling of DBIRDs and simulation results of the current-voltage characteristics under dark and illuminated conditions are also presented. They predict that dual-band operation of the DBIRD will produce low dark currents and 27-33% quantum efficiencies for the in-band photons in the BC with λc=5.58 μm, and a nearly-constant 33% in the RC with λc=8.05 μm. The spectral quantum efficiency of the BC for 500 K blackbody radiation is approximately 20% over the range of λ=3 − 4.2 μm, while that of the RC has a peak of 42% at 5.7 μm. The DBIRD may provide improved high-speed dual-band imaging in comparison with NBn dual-band detectors.
Keywords
Dual-band infrared detector; Barrier engineering; Type-II superlattices; T2SL device modeling; Independently accessible; High speed dual-band thermal imaging
Subject
Physical Sciences, Optics and Photonics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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