Ulster University Logo

Ulster Institutional Repository

Electron Field Emission of Silicon-Doped Diamond-Like Carbon Thin Films

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Ray, SC, Ghosh, SK, Chiguvare, Z, Palnitkar, U, Pong, WF, Lin , IN, Papakonstantinou, P and Strydom, AM (2010) Electron Field Emission of Silicon-Doped Diamond-Like Carbon Thin Films. Japanese Journal of Applied Physics, 49 . 111301-1-111301-6. [Journal article]

[img]
Preview
PDF
467Kb

Abstract

In this work we demonstrate that the field emission characteristics of disordered Si-doped diamond-like carbon (DLC) thin films depend not only on properties of the conductive clustered sp2 phase and the insulating sp3 matrix (or sp2/sp3 ratio) but also on the presence of Si–Hn and C–Hn species in the film. The presence of such species reduces the hardness of the film and simultaneously enhances the field emission performance.A turn on electric field (ETOF) of 6.76 V/mm produced a field emission current density of 0:2mA/cm2, when an electric field of ~20 V/mm was applied. The Fowler–Nordheim (FN) tunneling model is appropriate to explain the field emission mechanism only within limited range of the current density. However, it is found that there is an apparent crossover between space charge limited current (SCLC) and the Frenkel effect due to impurities incorporated during the fabrication of Si-DLC films. This combined effect (SCLC + Frenkel) allows for the emission of electrons from the top of the reduced barriers due to the formation of comparatively soft DLC:Si films. The emission also occurs through tunneling from one conductive cluster (sp2 C=C) to another separated by an insulating matrix (sp3 C–C) after reducing the effective depth of a trap on application of high electric field.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:16848
Deposited By:Professor Pagona Papakonstantinou
Deposited On:18 Jan 2011 11:07
Last Modified:18 Jan 2011 11:07

Repository Staff Only: item control page