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Molybdenum disulfide for photodetectors THREE

The figure-of-merit for a photodetector is generally evaluated in terms of their photoresponsivity (R), specific detectivity (D*), noise equivalent power (NEP), and the photoresponse time. Photoresponsivity is an electrical response to an incident light illumination, and detectivity is associated with the lowest required optical power intensity for a photodetector to differentiate signal from the actual noise. The intensities of dark and photocurrents generated as a function of applied bias voltage and the values of photoresponsivity and detectivity at different operation wavelengths and optical power intensity are compared. The photoresponse rise and decay times are also measured to determine a photodetector's speed. TMDs, such as MoS2, WS2, MoSe2, and WSe2, show a tunable bandgap that changes from a direct bandgap in monolayers to an indirect bandgap in multilayers. Therefore, the optoelectronic properties of atomically thin layered TMDs can be tailored by utilizing their variable bandgaps and improving optical absorption by forming hybrid heterostructures. The large family of atomic-layered TMDs is very attractive for their application in broadband photodetectors. For example, the internal quantum efficiency (IQE) of 85% for MoS2, IQE of 70% with an ultrafast photoresponse time of 5.5 ps for WSe2, IQE of 91% for WSe2/MoSe2 heterostructures, photoresponsivity of 2578 A W−1 for monolayer WSe2/nitrogen-doped graphene quantum dots (N-GQDs), ultrafast charge transfer of 50 fs for MoS2/WS2 heterostructures after photoexcitation, and, interestingly, photoresponsivity as high as 1 × 1010 A W−1 at 130 K and 5 × 108 A W−1 at room temperature for a monolayer graphene/multilayer MoS2 hybrid structure illuminated at 632 nm with a power of 376 fW μm−2 with a response time of 1 × 103 s, demonstrate the suitability of atomic layered TMDs for developing optoelectronic devices, including photodetectors, LEDs, and solar cells. If you are looking for high quality, high purity, and cost-effective Molybdenum disulfide, or if you require the latest price of Molybdenum disulfide, please feel free to email contact mis-asia.

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