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New device concepts and materials for the fabrication of compact THz (> 100 GHz) nanoelectronic and vacuum nanoelectronic devices are of particular interest for broadband communication, security screening of packages and chemical materials, biomedical examination, and other applications. In particular, new compact and room-temperature THz imaging systems as well as environmental monitoring are...
Energies of emitted electrons from n-type diamond NEA surface and graphene/n-type diamond junction were measured by combined field emission spectroscopy/ultraviolet photoelectrons spectroscopy (FES/UPS) system. For n-type diamond NEA surface, the energies of emitted electrons indicated that the electrons emitted from conduction band of the diamond. For graphene/diamond junction, electron emission...
Improvement of the electron emission properties of the planar-type electron emission devices based on a graphene-oxide-semiconductor (GOS) structure was achieved by vacuum annealing at 300 oC. Electron emission efficiency of GOS type electron emission devices reached 2.7 % from 0.2 % after vacuum annealing. The work function of graphene electrode was found to decrease 0.26 eV after vacuum annealing...
In this work, we present FEAs based on silicon field emitter tips on top of silicon nanowires with four different device structures: (a) buried tips, (b) buried tips with graphene, (c) released tips, and (d) released tips with graphene. Measured device parameters are used to characterize the performance of the devices. In general, we obtain low turn-on voltages when bFN is low. Additional studies...
This paper presents the electric field distribution and current emission in a vacuum nano-diode. The electric field is calculated exactly inside a finite vacuum cathode-anode (A-K) gap with a single trapezoid protrusion on one of the electrode surface. It is found there is strong field enhancement on both electrodes near the protrusion, when the ratio of the A-K gap distance to the protrusion height...
Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference...
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