skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Graphene diamond-like carbon films heterostructure

Abstract

A limitation to the potential use of graphene as an electronic material is the lack of control over the 2D materials properties once it is deposited on a supporting substrate. Here, the use of Diamond-like Carbon (DLC) interlayers between the substrate and the graphene is shown to offer the prospect of overcoming this problem. The DLC films used here, more properly known as a-C:H with ∼25% hydrogen content, have been terminated with N or F moieties prior to graphene deposition. It is found that nitrogen terminations lead to an optical band gap shrinkage in the DLC, whilst fluorine groups reduce the DLC's surface energy. CVD monolayer graphene subsequently transferred to DLC, N terminated DLC, and F terminated DLC has then been studied with AFM, Raman and XPS analysis, and correlated with Hall effect measurements that give an insight into the heterostructures electrical properties. The results show that different terminations strongly affect the electronic properties of the graphene heterostructures. G-F-DLC samples were p-type and displayed considerably higher mobility than the other heterostructures, whilst G-N-DLC samples supported higher carrier densities, being almost metallic in character. Since it would be possible to locally pattern the distribution of these differing surface terminations, this workmore » offers the prospect for 2D lateral control of the electronic properties of graphene layers for device applications.« less

Authors:
;
Publication Date:
OSTI Identifier:
22395711
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMIC FORCE MICROSCOPY; CARRIER DENSITY; CARRIER MOBILITY; CHEMICAL VAPOR DEPOSITION; DIAMONDS; ELECTRICAL PROPERTIES; FILMS; FLUORINE; GRAPHENE; HALL EFFECT; LAYERS; NITROGEN; POTENTIALS; SUBSTRATES; SURFACE ENERGY; SURFACES; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Zhao, Fang, Afandi, Abdulkareem, and Jackman, Richard B., E-mail: r.jackman@ucl.ac.uk. Graphene diamond-like carbon films heterostructure. United States: N. p., 2015. Web. doi:10.1063/1.4914495.
Zhao, Fang, Afandi, Abdulkareem, & Jackman, Richard B., E-mail: r.jackman@ucl.ac.uk. Graphene diamond-like carbon films heterostructure. United States. doi:10.1063/1.4914495.
Zhao, Fang, Afandi, Abdulkareem, and Jackman, Richard B., E-mail: r.jackman@ucl.ac.uk. Mon . "Graphene diamond-like carbon films heterostructure". United States. doi:10.1063/1.4914495.
@article{osti_22395711,
title = {Graphene diamond-like carbon films heterostructure},
author = {Zhao, Fang and Afandi, Abdulkareem and Jackman, Richard B., E-mail: r.jackman@ucl.ac.uk},
abstractNote = {A limitation to the potential use of graphene as an electronic material is the lack of control over the 2D materials properties once it is deposited on a supporting substrate. Here, the use of Diamond-like Carbon (DLC) interlayers between the substrate and the graphene is shown to offer the prospect of overcoming this problem. The DLC films used here, more properly known as a-C:H with ∼25% hydrogen content, have been terminated with N or F moieties prior to graphene deposition. It is found that nitrogen terminations lead to an optical band gap shrinkage in the DLC, whilst fluorine groups reduce the DLC's surface energy. CVD monolayer graphene subsequently transferred to DLC, N terminated DLC, and F terminated DLC has then been studied with AFM, Raman and XPS analysis, and correlated with Hall effect measurements that give an insight into the heterostructures electrical properties. The results show that different terminations strongly affect the electronic properties of the graphene heterostructures. G-F-DLC samples were p-type and displayed considerably higher mobility than the other heterostructures, whilst G-N-DLC samples supported higher carrier densities, being almost metallic in character. Since it would be possible to locally pattern the distribution of these differing surface terminations, this work offers the prospect for 2D lateral control of the electronic properties of graphene layers for device applications.},
doi = {10.1063/1.4914495},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 10,
volume = 106,
place = {United States},
year = {2015},
month = {3}
}