Ageing mechanisms and reliability of graphene-based electrodes

Yuanyuan Shi, Yanfeng Ji, Fei Hui, Hai Hua Wu, Mario Lanza

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The development of flexible transparent electrodes for next generation devices has been appointed as the major topic in carbon electronics research for the next five years. Among all candidate materials tested to date, graphene and graphene based nanocomposites have shown the highest performance. Although some incipient anti-oxidation tests have been reported, in-deep ageing studies to assess the reliability of carbon-based electrodes have never been performed before. In this work, we present a disruptive methodology to assess the ageing mechanisms of graphene electrodes, which is also extensible to other carbonbased and two-dimensional materials. After performing accelerated oxidative tests, we exhaustively analyze the yield of the electrodes combining nanoscale and device level experiments with Weibull probabilistic analyses and tunneling current simulation, based on the Fowler-Nordheim/Direct-Tunneling models. Our experiments and calculations reveal that an ultra-thin oxide layer can be formed on the pristine surface of graphene. We quantitatively analyze the consequences of this layer on the properties of the electrodes, and observed a change in the conduction mode at the interface (from Ohmic to Schottky), an effect that should be considered in the design of future graphene-based devices. Future mass production of carbon-based devices should include similar reliability studies, and the methodologies presented here (including the accelerated tests, characterization and modeling) may help other scientists to move from lab prototypes towards industrial device production.
Original languageEnglish (US)
Pages (from-to)1820-1831
Number of pages12
JournalNano Research
Volume7
Issue number12
DOIs
StatePublished - Dec 19 2014
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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