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Title: Driving chemical interactions at graphene-germanium van der Waals interfaces via thermal annealing

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5053083· OSTI ID:1493753
 [1];  [1];  [2];  [3];  [2]; ORCiD logo [4];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  2. Univ. of Wisconsin-Madison, Madison, WI (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northwestern Univ., Evanston, IL (United States)

Despite its extraordinary charge carrier mobility, the lack of an electronic bandgap in graphene limits its utilization in electronic devices. To overcome this issue, researchers have attempted to chemically modify the pristine graphene lattice in order to engineer its electronic bandstructure. While significant progress has been achieved, aggressive chemistries are often employed that are difficult to pattern and control. In an effort to overcome this issue, here we utilize the well-defined van der Waals interface between crystalline Ge(110) and epitaxial graphene to template covalent chemistry. In particular, by annealing atomically pristine graphene-germanium interfaces synthesized by chemical vapor deposition under ultra-high vacuum conditions, chemical bonding is driven between the germanium surface and the graphene lattice. The resulting bonds act as charge scattering centers that are identified with scanning tunneling microscopy. The generation of atomic-scale defects are independently confirmed with Raman spectroscopy, revealing significant densities within the graphene lattice. Furthermore, the resulting chemically modified graphene has the potential to impact next-generation nanoelectronic applications.

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:
1493753
Journal Information:
Applied Physics Letters, Vol. 113, Issue 21; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (1)

CVD graphene/Ge interface: morphological and electronic characterization of ripples journal August 2019

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