Opin vísindi

Space–charge limited current in nanodiodes: Ballistic, collisional, and dynamical effects

Space–charge limited current in nanodiodes: Ballistic, collisional, and dynamical effects

Title: Space–charge limited current in nanodiodes: Ballistic, collisional, and dynamical effects
Author: Zhang, Peng
ANG, YEE SIN   orcid.org/0000-0002-1637-1610
Garner, Allen   orcid.org/0000-0001-5416-7437
Valfells, Agust   orcid.org/0000-0002-6561-4957
Luginsland, John   orcid.org/0000-0002-6130-6156
ANG, LAY KEE   orcid.org/0000-0003-2811-1194
Date: 2021-03-14
Language: English
Scope: 100902
University/Institute: Reykjavík University (RU)
Háskólinn í Reykjavík (HR)
School: Tæknisvið (HR)
School of Technology (RU)
Department: Verkfræðideild (HR)
Department of Engineering (RU)
Series: Journal of Applied Physics;129(10)
ISSN: 0021-8979
1089-7550 (eISSN)
DOI: https://doi.org/10.1063/5.0042355
Subject: General Physics and Astronomy; Surface Multipactor Discharge; Virtual Cathode Formation; Field-emission; Electron-emission; Current Flow; Vacuum Transistor; Ccurrent-density; In-field; Transport; Eðlisfræði; Stjörnufræði
URI: https://hdl.handle.net/20.500.11815/2643

Show full item record


Zhang, P., Ang, Y. S., Garner, A. L., Valfells, Á., Luginsland, J. W., & Ang, L. K. (2021). Space–charge limited current in nanodiodes: Ballistic, collisional, and dynamical effects. Journal of Applied Physics, 129(10), 100902. https://doi.org/10.1063/5.0042355


This Perspective reviews the fundamental physics of space–charge interactions that are important in various media: vacuum gap, air gap, liquids, and solids including quantum materials. It outlines the critical and recent developments since a previous review paper on diode physics [Zhang et al. Appl. Phys. Rev. 4, 011304 (2017)] with particular emphasis on various theoretical aspects of the space–charge limited current (SCLC) model: physics at the nano-scale, time-dependent, and transient behaviors; higher-dimensional models; and transitions between electron emission mechanisms and material properties. While many studies focus on steady-state SCLC, the increasing importance of fast-rise time electric pulses, high frequency microwave and terahertz sources, and ultrafast lasers has motivated theoretical investigations in time-dependent SCLC. We particularly focus on recent studies in discrete particle effects, temporal phenomena, time-dependent photoemission to SCLC, and AC beam loading. Due to the reduction in the physical size and complicated geometries, we report recent studies in multi-dimensional SCLC, including finite particle effects, protrusive SCLC, novel techniques for exotic geometries, and fractional models. Due to the importance of using SCLC models in determining the mobility of organic materials, this paper shows the transition of the SCLC model between classical bulk solids and recent two-dimensional (2D) Dirac materials. Next, we describe some selected applications of SCLC in nanodiodes, including nanoscale vacuum-channel transistors, microplasma transistors, thermionic energy converters, and multipactor. Finally, we conclude by highlighting future directions in theoretical modeling and applications of SCLC.


© 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)

Files in this item

This item appears in the following Collection(s)