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• W4328007085 abstract "Due to the short carrier diffusion length, the extraction of photogenerated carriers is one of the key issues in InAs/GaSb superlattice (SL) photodetectors. Here, we report a midinfrared InAs/GaSb SL absorber with a stepped band alignment. The stepped absorber facilitates a better carrier extraction efficiency. Simulation results show that the proposed nBn detector with a stepped absorber exhibited a substantial performance improvement over the nBn detectors with uniform absorbers. At 150 K, the detector with a 3.6- <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$mu text{m}$ </tex-math></inline-formula> -thick stepped absorber has a maximum quantum efficiency (QE) of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim $ </tex-math></inline-formula> 46%, which is about 16% higher than that of the detectors with uniform absorbers. The maximum specific detectivity reached <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$sim 4.26times 10^{{10}}$ </tex-math></inline-formula> cm <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$cdot $ </tex-math></inline-formula> Hz <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$^{text {1/{2}}}$ </tex-math></inline-formula> /W at 4.9 <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$mu text{m}$ </tex-math></inline-formula> under −0.2 V bias. With the enhanced carrier extraction efficiency, the detectivity can gained a further improvement with a thicker stepped absorber, unlike the detector with a uniform absorber where the detectivity deteriorated with the absorber thickness increased from 3.6 to <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex-math notation=LaTeX>$4.2 mu text{m}$ </tex-math></inline-formula> ." @default.
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• W4328007085 date "2023-05-01" @default.
• W4328007085 modified "2023-10-16" @default.
• W4328007085 title "High-Performance Midwave Type-II Superlattice Infrared Photodetectors With a Stepped InAs/GaSb Absorber" @default.
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• W4328007085 doi "https://doi.org/10.1109/ted.2023.3256965" @default.
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