Campus Units
Chemistry, Materials Science and Engineering, Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Submitted Manuscript
Publication Date
9-9-2020
Journal or Book Title
The Journal of Physical Chemistry Letters
DOI
10.1021/acs.jpclett.0c02113
Abstract
Paradoxically a very broad diffraction background, named the Bell-Shaped-Component (BSC), has been established as a feature of graphene growth. Although the BSC has been present in the earlier literature it has been ignored. Recent diffraction studies as a function of electron energy have shown that the BSC is not related to scattering interference. The BSC is a very strong effect, but its origin is still unclear. Here, additional experiments are carried out as a function of temperature while monitoring changes in the intensity of different spots over the range that single-layer-graphene (SLG) grows. Quantitative fitting of the profiles shows that the BSC follows the increase of the G(10) spot, proving directly that BSC is an indicator of 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 spatial confinement within SLG and surprisingly it is an excellent measure of graphene uniformity, instead of film disorder.
Copyright Owner
American Chemical Society
Copyright Date
2020
Language
en
File Format
application/pdf
Recommended Citation
Chen, Shen; von Hoegen, Michael Horn; Thiel, Patricia A.; Kaminski, Adam; Schrunk, Benjamin; Speliotis, Thanassis; Conrad, Edward Henry; and Tringides, Michael C., "High Layer Uniformity of 2-d Materials Surprisingly From Broad Features in Surface Electron Diffraction" (2020). Chemistry Publications. 1256.
https://lib.dr.iastate.edu/chem_pubs/1256
Included in
Biological and Chemical Physics Commons, Materials Chemistry Commons, Materials Science and Engineering Commons, Physical Chemistry Commons
Comments
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in The Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review. To access the final edited and published work see DOI: 10.1021/acs.jpclett.0c02113. Posted with permission.