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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
Summary
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.
- 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.
