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Inverse transfer method using polymers with various functional groups for controllable graphene doping.

Seong Kyu Lee1, Jae Won Yang, Hyun Ho Kim

  • 1Department of Chemical Engineering and ‡Department of Chemistry, Pohang University of Science and Technology (POSTECH) , Pohang, 790-784, Korea.

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Summary

This study introduces an inverse transfer method (ITM) for residue-free graphene transfer and doping. The method utilizes functionalized polymers to tune graphene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Electronics

Background:

  • Polymer-supported transfer of chemical vapor deposition (CVD)-grown graphene is crucial for large-area applications.
  • Residues from conventional transfer methods impede the use of graphene in electronic and photonic devices.

Purpose of the Study:

  • To develop a novel inverse transfer method (ITM) for simultaneous graphene transfer and doping.
  • To eliminate undesirable polymer and solvent residues in transferred graphene.
  • To enable tunable doping of graphene for enhanced device performance.

Main Methods:

  • An inverse transfer method (ITM) using polymers with varying functional groups was developed.
  • The polymer layer acts as an integrated doping layer at the graphene-substrate interface.
  • Theoretical models were used to understand the dipole layer-induced doping mechanism.

Main Results:

  • The ITM successfully transferred graphene without residues.
  • Polymers with electron-donating or -withdrawing groups induced n-type or p-type doping, respectively.
  • Work function and Dirac point shifts were experimentally measured and theoretically explained.
  • Electrical properties of pentacene field-effect transistors with graphene electrodes were enhanced.

Conclusions:

  • The ITM offers a residue-free approach for graphene transfer and doping.
  • Tunable doping via functionalized polymers is demonstrated, impacting graphene's electronic properties.
  • This method provides a versatile route for integrating CVD graphene into organic electronic devices.