Titanium contacts to graphene: Process-induced variability in electronic and thermal transport

Keren M. Freedy, Ashutosh Giri, Brian M. Foley, Matthew R. Barone, Patrick E. Hopkins, Stephen McDonnell

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Contact resistance (R C) is a major limiting factor in the performance of graphene devices. R C is sensitive to the quality of the interface and the composition of the contact, which are affected by the graphene transfer process and contact deposition conditions. In this work, a linear correlation is observed between the composition of Ti contacts, characterized by x-ray photoelectron spectroscopy, and the Ti/graphene contact resistance measured by the transfer length method. We find that contact composition is tunable via deposition rate and base pressure. Reactor base pressure is found to effect the resultant contact resistance. The effect of contact deposition conditions on thermal transport measured by time-domain thermoreflectance is also reported. Interfaces with higher oxide composition appear to result in a lower thermal boundary conductance. Possible origins of this thermal boundary conductance change with oxide composition are discussed.

Original languageEnglish (US)
Article number145201
JournalNanotechnology
Volume29
Issue number14
DOIs
StatePublished - Feb 16 2018

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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