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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
This tutorial lecture provides an introduction (suitable for those relatively new to the subject) to methods available for the extraction of emitter characterization data from field electron emission (FE) current-voltage data, to the problems of doing this reliably, and to some recent progress in developing better understanding of the issues involved.
Vacuum micro/nano electronic devices possess merits of radiation hardness, temperature tolerance, high working frequency and output power. It's regarded as the promising candidates for the application on ultra-high speed transistor [1, 2], portable and fast-switch X-ray source [3], free electron laser [4], field emission display [5] and so on. In the developing of modern vacuum electronic, to achieve...
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...
With a large-area field electron emitter, when an individual post-like emitter is sufficiently resistive, and current through it sufficiently large, then voltage loss occurs along it. This conference presentation provides a simple analytical and conceptual demonstration that this voltage loss is directly and inextricably linked to a reduction in the field enhancement factor (FEF) at the post apex,...
In this work, we analyze properties of cold field emission from a low-dimensional, paraboloidal emitter tip. We find that the entirety of the emitted current density (ECD) originates from a few high-energy, zero-angular-momentum subbands and from a region on the tip that is highly localized around the apex. In addition, Fowler-Nordheim (FN) plots for such emitters are non-linear and do not serve as...
The eigenstates of a paraboloidal nano-tip are obtained by solving exactly Schroedinger's equation. Then the incident current density (ICD) and parallel velocity of such an emitter are obtained and shown to exhibit a non-Fowler-Nordheim behavior. These explain partly the resolution of Near-Field SEM. Competing effects between the ICD and an applied field at constant voltage are found.
Field emission from “nano diodes” encounter strong deviations from the tunneling barrier presupposed in Fowler Nordheim theory. Modifications to the emission barrier are modeled using a hyperbolic geometry to find trajectories along which Gamow factor is found; a quadratic equivalent potential is determined, and a shape factor method is used to evaluate the total current from a protrusion or wedge...
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...
ZnO nanowire field emitter arrays with non-coplanar focus electrode structure was designed. A simulation was conducted to verified the focusing ability of the focus electrode structure. The designed structure was realized successfully and the growth condition of ZnO nanowires in the structure was studied.
The sputtering of Mo Spindt emitter due to the gate absorbent are observed when nA level emission current is collected by the gate for a duration of tens of seconds under a vacuum of 1×10−7 Torr.
Thermionic dispenser cathodes are widely used in microwave devices because of their high current densities. Several investigations have shown that the structural arrangement and coverage of atoms or molecules on tungsten surface can dramatically reduce the work function. Theoretically, work function was reduced and increased by electropositive and electronegative adsorbates, respectively. In this...
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