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Monolayer MoSe <sub/>2</sub> /NiO van der Waals heterostructures for infrared light-emitting diodes
摘要： Nowadays monolayer transition metal chalcogenides (TMCs) have been widely researched due to their excellent optoelectronic properties. However, the preparation of large-sized monolayer TMCs and high-power TMC-based light-emitting diodes are still full of challenges, which limit their application in two-dimensional devices. Here, the large-sized monolayer single-crystalline MoSe2 was synthesized by chemical vapor deposition. The influence of the relative gas pressure ratio of MoO3 to Se on MoSe2 morphology is discussed. The TEM analysis confirmed the presence of 2H-phase monolayer MoSe2. A photoluminescence peak from the MoSe2 monolayer is detected at about 804 nm, illustrating an intrinsic energy bandgap of 1.54 eV. Importantly, a novel 2D/3D heterostructure, monolayer MoSe2/NiO van der Waals heterostructure, is constructed for a light-emitting diode (LED). The electroluminescence peaks of n-MoSe2/p-NiO LED locate at 812 nm, 848 nm and 918 nm, all of which are in the infrared light range. Interestingly, the electroluminescence peaks of our n-MoSe2/p-NiO LED are close to those of conventional air conditioner telecontrollers. So the n-MoSe2/p-NiO infrared LED is forward to be used in infrared remote sensing systems in the future.
关键词： van der Waals heterostructures,infrared light-emitting diodes,Monolayer MoSe2,chemical vapor deposition,NiO
更新于2025-09-16 10:30:52
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Optically Pumped Monolayer MoSe <sub/>2</sub> Excitonic Lasers from Whispering Gallery Mode Microcavities
摘要： Developing integrable, nanoscale, and low-energy-consumption lasers is a crucial step toward on-chip optical communications and computing technologies. The strong exciton-photon interaction emerged in monolayer transition metal dichalcogenides (TMDs) holds promise for engineering and integration. Herein we prepare the MoSe2/microsphere cavities excitonic lasers by placing SiO2 microspheres on top of monolayer MoSe2 film. By virtue of continuous wave exciting MoSe2/microsphere whispering-gallery-mode (WGM) cavities, we realize multiple excitonic WGM lasing in the emission wavelength range of ～750 nm to 875 nm at room temperature with tunable properties of free spectral range (FSR) and full width at half maximum (FWHM) by varying the microsphere size. Theoretical calculations based on finite element method (FEM) using COMSOL software were utilized to identify lasing modes and reveal the corresponding electric ?eld distribution. These findings help to deepen fundamental understanding of excitonic WGM lasing, and provide a promising research platform for integrable, scalable, and low-cost laser devices.
关键词： Whispering Gallery Mode Microcavities,Monolayer MoSe2,Optically Pumped,Excitonic Lasers
更新于2025-09-12 10:27:22