Prosiectau fesul blwyddyn
Crynodeb
The evolution of the diamond (111) surface as it undergoes reconstruction and subsequent graphene formation is investigated with angle-resolved photoemission spectroscopy, low energy electron diffraction, and complementary density functional theory calculations. The process is examined starting at the C(111)−(2×1) surface reconstruction that occurs following detachment of the surface adatoms at 920 ∘C, and continues through to the liberation of the reconstructed surface atoms into a freestanding monolayer of epitaxial graphene at temperatures above 1000 ∘C. Our results show that the C(111)−(2×1) surface is metallic as it has electronic states that intersect the Fermi level. This is in strong agreement with a symmetrically π-bonded chain model and should contribute to resolving the controversies that exist in the literature surrounding the electronic nature of this surface. The graphene formed at higher temperatures exists above a newly formed C(111)−(2×1) surface and appears to have little substrate interaction as the Dirac point is observed at the Fermi level. Finally, we demonstrate that it is possible to hydrogen-terminate the underlying diamond surface by means of plasma processing without removing the graphene layer, forming a graphene-semiconductor interface. This could have particular relevance for doping the graphene formed on the diamond (111) surface via tuneable substrate interactions as a result of changing the terminating species at the diamond-graphene interface by plasma processing.
Iaith wreiddiol | Saesneg |
---|---|
Rhif yr erthygl | 5304 |
Nifer y tudalennau | 10 |
Cyfnodolyn | Physical Review B |
Cyfrol | 105 |
Rhif cyhoeddi | 20 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 18 Mai 2022 |
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'Diamond (111) surface reconstruction and epitaxial graphene interface'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Prosiectau
- 2 Wedi Gorffen
-
SPARC II - Solar Photovoltaic Academic Research
Evans, A. (Prif Ymchwilydd)
01 Ion 2016 → 31 Maw 2023
Prosiect: Ymchwil a ariannwyd yn allanol
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EPSRC centre for doctoral raining in Diamond Science and Techology
Evans, A. (Prif Ymchwilydd)
Engineering & Physical Sciences Research Council
01 Ebr 2014 → 30 Medi 2022
Prosiect: Ymchwil a ariannwyd yn allanol