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Approaching completely continuous centimeter-scale graphene by copolymer-assisted transfer.

Arka Karmakar1, Farah Vandrevala1, Florian Gollier2

  • 1Department of Electrical Engineering, University at Buffalo Buffalo NY USA erikeina@buffalo.edu.

RSC Advances
|May 11, 2022
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Summary

This study introduces a new copolymer-assisted method for transferring graphene, significantly reducing defects like cracks and wrinkles. This technique achieves 99.8% continuous centimeter-scale graphene, improving transfer quality for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Graphene transfer from copper foil to substrates often results in defects such as cracks, holes, and wrinkles.
  • Existing poly(methylmethacrylate) (PMMA) based methods struggle to achieve defect-free large-area graphene transfer.
  • Minimizing defects is crucial for reliable graphene device fabrication and performance.

Purpose of the Study:

  • To develop a nondestructive method for transferring large-scale graphene with minimal defects.
  • To improve the continuity and quality of transferred graphene films.
  • To investigate the mechanism behind defect reduction using a novel transfer approach.

Main Methods:

  • Utilized a commercially available copolymer in conjunction with poly(methylmethacrylate) (PMMA) for graphene transfer.
  • Characterized the transferred graphene using Raman spectroscopy, quantitative image analysis, scanning electron microscopy (SEM), and terahertz time-domain spectroscopy (THz-TDS).
  • Compared the copolymer-assisted method with conventional PMMA-based transfer techniques.

Main Results:

  • Achieved 99.8% continuous centimeter-scale transferred graphene.
  • The copolymer-assisted method significantly reduced holes compared to conventional methods.
  • Effectively eliminated cracks and wrinkles in the transferred graphene.
  • Demonstrated improved contact at the PMMA-graphene interface due to enhanced PMMA relaxation.

Conclusions:

  • The copolymer-assisted PMMA method offers a superior approach for high-quality graphene transfer.
  • Enhanced relaxation of PMMA by the copolymer layer is key to preventing transfer-induced defects.
  • This technique enables the reliable production of large-area, defect-free graphene for various applications.