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Molybdenum disulfide for photodetectors

Shows the wide range of the electromagnetic spectrum covered by 2D nanomaterials, from the near-infrared (NIR) and mid-IR (MIR) to the far-IR (FIR), the related applications of these nanomaterials in electronics, optoelectronics, and photonics, and the atomic and band structures of 2D materials, including hexagonal boron nitride (h-BN), molybdenum disulfide (MoS2), black phosphorus (BP) and graphene. H-BN is an insulator with a large bandgap of 6.0 eV, whereas MoS2 and BP are semiconductors with sizeable bandgaps that vary with the number of atomic layers. Graphene is a zero bandgap semimetal. Monolayer graphene exhibits 97.7% optical transparency independent of the optical wavelength in the 450–800 nm spectral region; the transparency decreases proportionally with increasing graphene layers. Monolayer graphene absorbs only 2.3% of incident white light; therefore, monolayer (1L) graphene's photoresponsivity is limited due to the low absorbance in the visible region. The insulating layers of an h-BN dielectric have been used along with other 2D materials, such as graphene, BP, and TMDs, including MoS2, MoSe2, WS2, WSe2, MoTe2, etc., to develop electronic and optoelectronic devices. Graphene-based materials have been extensively studied for photodetectors because of their high carrier mobility and strong interaction with light over a broad spectral range. However, graphene-based photodetectors suffer from low photoresponsivity due to graphene's weak optical absorption. Guo et al. have fabricated broadband photodetectors utilizing multilayer BP operating over the 532 nm to 3.39 μm wavelength range. Comparatively, TMDs have a large electronic density of states, giving rise to high optical absorption and ultrafast charge transfer, making them more suitable for photodetectors. Bernardi et al. reported 5–10% incident sunlight absorption by MoS2, MoSe2, and WS2 monolayers for a thickness of >1 nm, which is higher than the value of 2.3% exhibited by monolayer and one order of magnitude higher than those of thin films of the conventional semiconductors GaAs and Si, generally used for solar energy applications. Compares the computed and measured absorbance of monolayer (1L) MoS2. The computed absorbance of 1L MoS2 was obtained using density functional theory (DFT) calculations, the GW method, and the Bethe–Salpeter equation (BSE), while experimental absorbance was reported by Mak et al. The quantitative agreement was observed between the computed and experimentally measured absorbance of 1L MoS2. 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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