Abstract：
:Graphene grown directly on germanium is a possible route for the integration of graphene into nanoelectronic devices as well as it is of great interest for materials science. The morphology of the interface between graphene and germanium influences the electronic properties and has not already been completely elucidated at atomic scale. In this work, we investigated the morphology of the single-layer graphene grown on Ge substrates with different crystallographic orientations. We determined the presence of sinusoidal ripples with a single propagation direction, zig-zag, and could arise due to compressive biaxial strain at the interface generated as a result of the opposite polarity of the thermal expansion coefficient of graphene and germanium. Local density of states measurements on the ripples showed a linear dispersion relation with the Dirac point slightly shifted with respect to the Fermi energy indicating that these out-of-plane deformations were n-doped, while the graphene regions between the highs were undoped.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Mendoza CD,Figueroa NS,Maia da Costa MEH,Freire FL Jrdoi
10.1038/s41598-019-48998-1subject
Has Abstractpub_date
2019-08-29 00:00:00pages
12547issue
1issn
2045-2322pii
10.1038/s41598-019-48998-1journal_volume
9pub_type
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