Diamond (111) surface reconstruction and epitaxial graphene interface
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2022-05-18 |
| Journal | Physical review. B./Physical review. B |
| Authors | Benjamen P. Reed, Marianne EtzelmĆ¼ller Bathen, Johnathan Ash, Claire J. Meara, Alexei Zakharov |
| Institutions | ETH Zurich, University of Oslo |
| Citations | 15 |
| Analysis | Full AI Review Included |
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View Original Abstract
The evolution of the diamond (111) surface as it undergoes reconstruction and\nsubsequent graphene formation is investigated with angle-resolved photoemission\nspectroscopy, low energy electron diffraction, and complementary density\nfunctional theory calculations. The process is examined starting at the\nC(111)-(2x1) surface reconstruction that occurs following detachment of the\nsurface adatoms at 920 {\deg}C, and continues through to the liberation of the\nreconstructed surface atoms into a free-standing monolayer of epitaxial\ngraphene at temperatures above 1000 {\deg}C. Our results show that the\nC(111)-(2x1) surface is metallic as it has electronic states that intersect the\nFermi-level. This is in strong agreement with a symmetrically {\pi}-bonded\nchain model and should contribute to resolving the controversies that exist in\nthe literature surrounding the electronic nature of this surface. The graphene\nformed at higher temperatures exists above a newly formed C(111)-(2\times1)\nsurface and appears to have little substrate interaction as the Dirac-point is\nobserved at the Fermi-level. Finally, we demonstrate that it is possible to\nhydrogen terminate the underlying diamond surface by means of plasma processing\nwithout removing the graphene layer, forming a graphene-semiconductor\ninterface. This could have particular relevance for doping the graphene formed\non the diamond (111)surface via tuneable substrate interactions as a result of\nchanging the terminating species at the diamond-graphene interface by plasma\nprocessing.\n