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High Mobility Graphene on EVA/PET.

Munis Khan1, Kornelia Indykiewicz1,2, Pui Lam Tam3

  • 1Department of Microtechnology and Nanoscience, Chalmers University of Technology, 412 96 Göteborg, Sweden.

Nanomaterials (Basel, Switzerland)
|February 15, 2022
PubMed
Summary
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Annealing graphene films at 60°C after copper removal significantly boosts their Hall mobility. This method offers a cost-effective way to produce robust, flexible transparent conductive films for optoelectronics.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transparent conductive films (TCFs) are essential for flexible optoelectronics.
  • Graphene produced via chemical vapor deposition (CVD) offers a promising alternative for TCFs.
  • Transferring CVD graphene onto flexible substrates like ethylene vinyl acetate (EVA)/polyethylene terephthalate (PET) foil is crucial for manufacturing.

Purpose of the Study:

  • To investigate the effect of post-transfer annealing on the properties of CVD graphene films.
  • To enhance the Hall mobility of graphene-based transparent conductive films.
  • To establish a cost-effective and robust method for producing flexible TCFs.

Main Methods:

  • Chemical vapor deposition (CVD) of graphene on copper foil.
Keywords:
CVDflexible substratesgraphene

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  • Hot press lamination for transferring graphene onto EVA/PET foil.
  • Wet etching of copper foil using nitric acid.
  • Post-transfer annealing at 60°C under nitrogen flow.
  • Characterization using Raman spectroscopy, Scanning Electron Microscopy (SEM), and X-ray Photoelectron Spectroscopy (XPS).

    • Main Results:

    • Annealing significantly enhanced the Hall mobility of the transferred graphene films.
    • The annealing process improved the electrical conductivity of the transparent conductive films.
    • Morphology and chemical composition were evaluated, confirming the integrity of the graphene post-treatment.

    Conclusions:

    • Post-transfer annealing at 60°C is an effective method to improve graphene TCF performance.
    • This technique provides a scalable and affordable route for manufacturing flexible and conductive graphene films.
    • The enhanced graphene films are suitable for advanced optoelectronic applications.