Thumbnail
Access Restriction
Open

Author Aydogan, Pinar ♦ Suzer, Sefik ♦ Arslan, Engin ♦ Cakmakyapan, Semih ♦ Ozbay, Ekmel ♦ Strupinski, Wlodek
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ BINDING ENERGY ♦ ELECTRIC POTENTIAL ♦ GRAPHENE ♦ INTERACTIONS ♦ LAYERS ♦ SILICON CARBIDES ♦ SUBSTRATES ♦ X-RAY PHOTOELECTRON SPECTROSCOPY
Abstract We report on an X-ray photoelectron spectroscopy (XPS) study of two graphene based devices that were analyzed by imposing a significant current under +3 V bias. The devices were fabricated as graphene layers(s) on hexagonal SiC substrates, either on the C- or Si-terminated faces. Position dependent potential distributions (IR-drop), as measured by variations in the binding energy of a C1s peak are observed to be sporadic for the C-face graphene sample, but very smooth for the Si-face one, although the latter is less conductive. We attribute these sporadic variations in the C-face device to the incomplete electrical decoupling between the graphene layer(s) with the underlying buffer and/or substrate layers. Variations in the Si2p and O1s peaks of the underlayer(s) shed further light into the electrical interaction between graphene and other layers. Since the potential variations are amplified only under applied bias (voltage-contrast), our methodology gives unique, chemically specific electrical information that is difficult to obtain by other techniques.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-09-21
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 12


Open content in new tab

   Open content in new tab