Title

High Layer Uniformity of Two-Dimensional Materials Demonstrated Surprisingly from Broad Features in Surface Electron Diffraction

Publication Date

9-9-2020

Department

Chemistry; Materials Science and Engineering; Ames Laboratory; Physics and Astronomy

Campus Units

Chemistry, Materials Science and Engineering, Physics and Astronomy, Ames Laboratory

OSTI ID+

1709117

Report Number

IS-J 10311

DOI

10.1021/acs.jpclett.0c02113

Journal Title

The Journal of Physical Chemistry Letters

Volume Number

11

Issue Number

21

First Page

8937

Last Page

8943

Abstract

Paradoxically, a very broad diffraction background, named the bell-shaped-component (BSC), has been established as a feature of graphene growth. Recent diffraction studies as a function of electron energy have shown that the BSC is not related to scattering interference. Here, additional experiments are carried out as a function of temperature over the range in which single-layer graphene (SLG) grows. Quantitative fitting of the profiles shows that the BSC follows the increase of the Gr(10) spot, proving directly that the BSC indicates high-quality graphene. Additional metal deposition experiments provide more information about the BSC. The BSC is insensitive to metal deposition, and it increases with metal intercalation, because a more uniform interface forms between graphene and SiC. These experiments support the conclusion that the BSC originates from electron confinement within SLG, and surprisingly, it is an excellent measure of graphene uniformity.

DOE Contract Number(s)

AC02-07CH11358

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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