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Title: Effects of polymethylmethacrylate-transfer residues on the growth of organic semiconductor molecules on chemical vapor deposited graphene

Scalably grown and transferred graphene is a highly promising material for organic electronic applications, but controlled interfacing of graphene thereby remains a key challenge. Here, we study the growth characteristics of the important organic semiconductor molecule para-hexaphenyl (6P) on chemical vapor deposited graphene that has been transferred with polymethylmethacrylate (PMMA) onto oxidized Si wafer supports. A particular focus is on the influence of PMMA residual contamination, which we systematically reduce by H{sub 2} annealing prior to 6P deposition. We find that 6P grows in a flat-lying needle-type morphology, surprisingly independent of the level of PMMA residue and of graphene defects. Wrinkles in the graphene typically act as preferential nucleation centers. Residual PMMA does however limit the length of the resulting 6P needles by restricting molecular diffusion/attachment. We discuss the implications for organic device fabrication, with particular regard to contamination and defect tolerance.
Authors:
;  [1] ;  [2] ;  [3] ;  [2] ;  [4] ; ;  [5] ; ; ;  [2]
  1. Institute of Physics, Montanuniversitaet Leoben, Franz Josef Straße 18, A 8700 Leoben (Austria)
  2. Department of Engineering, University of Cambridge, Cambridge CB3 0FA (United Kingdom)
  3. (Austria)
  4. (United States)
  5. Institute of Physics, Department for Solid State Physics and New Materials, University of Belgrade, Pregrevica 118, 11080 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22395721
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CHEMICAL VAPOR DEPOSITION; DIFFUSION; FABRICATION; GRAPHENE; HYDROGEN; INTERFACES; MOLECULES; MORPHOLOGY; NUCLEATION; ORGANIC SEMICONDUCTORS; PMMA; SILICON