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W4319342007 abstract "Van der Waals heterostructures of black phosphorous(BP) and Molybdenum Disulfide(MoS 2 ) is designed and evaluated for photodetection application from visible to mid-infrared wavelength up to 4.5 μm. The device possesses a low dark current less than 0.1 μA for short wavelength light. For visible and near infrared radiation, the contribution of heat and photo energy to current enhancement is analyzed. Dark current drift by joule heat and laser heat absorbed is observed in short waveband. The difference in response speed is believed to be a result of the competition of BP and MoS 2 photocurrent. Gate tunable response time and on-off ratio makes the device versatile in potential application. For mid infrared radiation, BP-MoS 2 heterojunction with a dedicated thickness tailoring of MoS 2 exhibits similar negative response as an intrinsic BP. The normalized detectivity is <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${D}^*$</tex-math></inline-formula> of <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$2.02 times {10}^8 Jones$</tex-math></inline-formula> for the 4.5 μm mid-infrared radiation. Elaborate reduction of the noise is conducted to get the time resolvable photo-response. A low bias is necessary for a time resolved photocurrent, reducing the flicker noise to an acceptable level." @default.
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W4319342007 date "2023-04-01" @default.
W4319342007 modified "2023-10-15" @default.
W4319342007 title "Visible to Mid-Infrared Photodetector Based on Black Phosphorous-MoS2 Van Der Waals Heterojunction" @default.
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W4319342007 doi "https://doi.org/10.1109/jphot.2023.3241285" @default.
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