Photodetectors fabricated with hybrid Molybdenum Disulfide


Photodetectors fabricated with hybrid Molybdenum Disulfide/PbS QDs yield significantly high photoresponsivity. 0D QDs have been used to improve the performance of Molybdenum Disulfide photodetectors. Huo et al. developed photodetectors by incorporating mercury telluride (HgTe) colloidal QD film into a TiO2-encapsulated few-layer Molybdenum Disulfide channel. In the Molybdenum Disulfide/TiO2/HgTe hybrid heterostructure, TiO2 is a buffer layer between the Molybdenum Disulfide channel and the HgTe QD layer that acts as an electron-accepting medium to form a p–n junction with the HgTe QDs to facilitate the transfer of photogenerated charges from the HgTe QDs to the Molybdenum Disulfide channel. Molybdenum Disulfide/TiO2/HgTe hybrid photodetectors showed a high photoresponsivity of 106 A W−1 under an incident power of 70 fW (0.35 μW cm−2) at a gate voltage (Vg) of −15 V and a Vds of 1 V, which is seven orders of magnitude higher than that of the HgTe QD photodetector due to the low carrier mobility (2 × 10−3 cm2 V−1 s−1) of the HgTe QDs. The detective of Molybdenum Disulfide/TiO2/HgTe hybrid photodetectors was 1 × 1012 Jones at a 2.0 μm wavelength, four orders of magnitude higher than that of pure HgTe-based photodetectors (107 to 108 Jones). This study is an excellent example of extending the spectral wavelengths of a Molybdenum Disulfide-based photodetector over 2.0 μm. In another study, Zhang et al. reported 2D Molybdenum Disulfide–0D zinc cadmium selenide (ZnCdSe)/Molybdenum Disulfide (ZnS) colloidal QD-based photodetectors, where monolayer (1L) to multilayer (ML) Molybdenum Disulfide thin film acts as a carrier transport channel and a core/shell ZnCdSe/ZnS QDs sensitizing thin layer functions as a light harvester. Compared the photoresponsivity and detectivity as a function of laser incident power for the pristine Molybdenum Disulfide based photodetectors with hybrid Molybdenum Disulfide–ZnCdSe/ZnS QD-based photodetectors having monolayer Molybdenum Disulfide (1L), bilayer Molybdenum Disulfide (2L), trilayer Molybdenum Disulfide (3L), and multilayer Molybdenum Disulfide (ML). There is a significant increase in photocurrent, photoresponsivity, and detective after adding ZnCdSe/ZnS QD sensitizing layer. The photocurrent of hybrid Molybdenum Disulfide–ZnCdSe/ZnS QD-based photodetectors increased by 1000 folds compared with pristine Molybdenum Disulfide photodetectors. 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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