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Title: Electronic and mechanical properties of graphene-germanium interfaces grown by chemical vapor deposition

Journal Article · · Nano Letters
 [1];  [2];  [1];  [3];  [3];  [2];  [3];  [4]
  1. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)

Epitaxially oriented wafer-scale graphene grown directly on semiconducting Ge substrates is of high interest for both fundamental science and electronic device applications. To date, however, this material system remains relatively unexplored structurally and electronically, particularly at the atomic scale. To further understand the nature of the interface between graphene and Ge, we utilize ultrahigh vacuum scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) along with Raman and X-ray photoelectron spectroscopy to probe interfacial atomic structure and chemistry. STS reveals significant differences in electronic interactions between graphene and Ge(110)/Ge(111), which is consistent with a model of stronger interaction on Ge(110) leading to epitaxial growth. Raman spectra indicate that the graphene is considerably strained after growth, with more point-to-point variation on Ge(111). Furthermore, this native strain influences the atomic structure of the interface by inducing metastable and previously unobserved Ge surface reconstructions following annealing. These nonequilibrium reconstructions cover >90% of the surface and, in turn, modify both the electronic and mechanical properties of the graphene overlayer. Finally, graphene on Ge(001) represents the extreme strain case, where graphene drives the reorganization of the Ge surface into [107] facets. From this study, it is clear that the interaction between graphene and the underlying Ge is not only dependent on the substrate crystallographic orientation, but is also tunable and strongly related to the atomic reconfiguration of the graphene–Ge interface.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1245135
Journal Information:
Nano Letters, Vol. 15, Issue 11; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 86 works
Citation information provided by
Web of Science

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Cited By (21)

Production and processing of graphene and related materials journal January 2020
Driving chemical interactions at graphene-germanium van der Waals interfaces via thermal annealing journal November 2018
Remote epitaxy through graphene enables two-dimensional material-based layer transfer journal April 2017
Alignment of semiconducting graphene nanoribbons on vicinal Ge(001) journal January 2019
Fabrication and characterization of SiC/Ge/graphene heterojunction with Ge micro-nano structures journal January 2020
Graphene on Group‐IV Elementary Semiconductors: The Direct Growth Approach and Its Applications journal February 2019
The graphene/n-Ge(110) interface: structure, doping, and electronic properties journal January 2018
Single-step growth of graphene and graphene-based nanostructures by plasma-enhanced chemical vapor deposition journal February 2019
Reactive intercalation and oxidation at the buried graphene-germanium interface journal July 2019
Dynamics of Antimonene–Graphene Van Der Waals Growth journal April 2019
Direct CVD Growth of Graphene on Technologically Important Dielectric and Semiconducting Substrates journal September 2018
Electronic and Interface Properties in Graphene Oxide/Hydrogen-Passivated Ge Heterostructure journal October 2018
Proton-assisted growth of ultra-flat graphene films journal January 2020
Morphological and Radio Frequency Characterization of Graphene Composite Films journal May 2018
Orientation-Dependent Strain Relaxation and Chemical Functionalization of Graphene on a Cu(111) Foil journal January 2018
Reactive intercalation and oxidation at the buried graphene-germanium interface text January 2019
Production and processing of graphene and related materials text January 2020
Production and processing of graphene and related materials text January 2020
CVD graphene/Ge interface: morphological and electronic characterization of ripples journal August 2019
Directed self-assembly of block copolymer films on atomically-thin graphene chemical patterns journal August 2016
Pattern Pick and Place Method for Twisted Bi- and Multi-Layer Graphene journal November 2019

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