Atomic Layer Deposition Alumina-Mediated Graphene Transfer for Reduced Process Contamination

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Abhay Shivayogimath
  • Lars Eriksson
  • Patrick R. Whelan
  • David Mackenzie

  • Birong Luo
  • Peter Bøggild
  • Timothy J. Booth

Research units

  • Danmarks Tekniske Universitet
  • Helsinki School of Economics

Abstract

Herein, an approach for integrating gate insulator deposition and graphene transfer steps in the fabrication of graphene field-effect devices is reported. A thin layer of Al2O3 is deposited by atomic layer deposition (ALD) onto as-grown graphene on copper, where the improved surface wettability of graphene on copper aids in obtaining a uniform deposition of the ALD layer. The ALD Al2O3/graphene stack is then mechanically delaminated from the copper surface and transferred onto the desired target substrate. An ALD layer thickness between 20 and 30 nm is optimal for facilitating such transfer. The ALD layer protects graphene from process contamination during subsequent transfer and device fabrication, resulting in reduced doping in measured field-effect devices.

Details

Original languageEnglish
Article number1900424
JournalPhysica Status Solidi - Rapid Research Letters
Publication statusPublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • atomic layer deposition, encapsulation, field-effect transistors (FETs), graphene, transfer

ID: 37107431