Authors:

Mihajlo-Joshua Foali Deganus

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About Paper:

As electronics continue to decrease in size to the nano-scale, the ability to generalize and understand the limits of nano-electronics becomes increasingly applicable and rewarding. Prior theoretical works have described nexus theory, as well as equating complex geometries to equivalent (canonical) planar systems. This allows for the generalization of full physics models, and the simplification of mathematical and simulation models. These, however, have yet to be fully verified. In this paper, we look at how applying these two methods, independently and in conjunction, compares to simulation results. Specifically, the transitions from the thermionic, field, and space charge limited emission regimes; in both planar (plate-to-plate) and prolate spheroidal (tip-to-plate) geometries.The data for this paper was gathered using the Reykjavík University Molecular Dynamics code for Electron Emission and Dynamics (RUMDEED) simulation code. Voltage was increased across the diode, at a set temperature and gap distance. The current density was calculated by the ramo-current and the emission density data outputs. The planar simulation data shows a smooth but distinct transition between the thermionic, field, and space charge limited emission mechanisms. Canonical plate-to-plate geometries, which possess an equivalent tip-to-plate geometry, have shown that there is indeed a congruence to using an equivalent planar system. These two findings, in concurrence, show that there is indeed much value in simplifying these nano-diode systems, allowing for greater computational efficiency. Keywords: Molecular Dynamics; Simulation; Space Charge Limited Current

Source:

Purdue University / 2025

Topics:

No topics listed

Co-authors:

Mihajlo-Joshua Foali Deganus