Abstract
Molybdenum disulfide has been intensively studied as a promising material for photodetector applications because of its excellent electrical and optical properties. We report a multilayer MoS2 film attached with a plasmonic tape for near-infrared (NIR) detection. MoS2 flakes are chemically exfoliated and transferred onto a polymer substrate, and silver nanoparticles (AgNPs) dewetted thermally on a substrate are transferred onto a Scotch tape. The Scotch tape with AgNPs is attached directly and simply onto the MoS2 flakes. Consequently, the NIR photoresponse of the MoS2 device is critically enhanced. The proposed tape transfer method enables the formation of plasmonic structures on arbitrary substrates, such as a polymer substrate, without requiring a high-temperature process. The performance of AgNPs-MoS2 photodetectors is approximately four times higher than that of bare MoS2 devices.
Highlights
Molybdenum disulfide has been intensively studied as a promising material for photodetector applications because of its excellent electrical and optical properties
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) show excellent optoelectronic performance because their bandgap can be adjusted by controlling the thickness
We reported that chemically exfoliated MoS2 could generate photocurrent by extending NIR light absorption up to the wavelength of 1,550 nm, and that the responsivity could be improved by forming a plasmonic nanostructure as an underlayer of M oS224
Summary
Molybdenum disulfide has been intensively studied as a promising material for photodetector applications because of its excellent electrical and optical properties. A Ag thin film was deposited and annealed to form randomized silver nanoparticles (AgNPs) successively on a substrate, and a MoS2 film was layered on the AgNPs array This thermal dewetting method is not applicable to polymer substrates, and the surface roughness due to the metal nanoparticles (NPs) may cause unexpected electrical and mechanical problems in the active layer of M oS2 flakes. We introduce a plasmonic-tape-attached multilayered MoS2 device to enhance NIR absorption and photocurrents In this device, chemically exfoliated M oS2 is first transferred onto a substrate, and a plasmonic tape is directly attached to the MoS2 film through a Scotch tape. We report that the plasmonic MoS2 device yields a sensitivity approximately four times that of the bare MoS2 device
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