Robust sandwiched fluorinated graphene for highly reliable flexible electronics

Mamina Sahoo, Jer Chyi Wang, Yuta Nishina, Zhiwei Liu, Jong Shing Bow, Chao Sung Lai

Research output: Contribution to journalArticle

Abstract

The high sensitivity of graphene to the surface condition of the gate dielectric layer and its poor van der Waals adhesion with a flexible substrate result in interfacial sliding and fracturing of graphene at low strains, making the successful utilization of pristine graphene (PG) in flexible electronics challenging. Here, we report a facile method for the fabrication of flexible graphene field effect transistors (F-GFETs) using sandwiched fluorinated graphene (FG). The “FG-PG-FG” sandwich structure shows a high optical transparency (>94%) with an average carrier mobility above 340 cm2/V·s, higher than that obtained when GO and Ion gel were used as gate dielectric materials on F-GFETs and a relatively low gate leakage current of ~160 pA. Furthermore, we observed a high mechanical stability, retaining >88% of the original current output against bending deformation of up to 6 mm and >77% after 200 bending cycles by applying a tensile strain of 1.56%, compared to the control sample. This improved performance is attributed to the fact that the sandwiched FG provides a good dielectric environment by tuning the C/F ratio, which tightly fixes the PG under strain. These findings provide a new route for the future development of graphene-based flexible electronics.

Original languageEnglish
Article number143839
JournalApplied Surface Science
Volume499
DOIs
Publication statusPublished - Jan 1 2020

Fingerprint

Flexible electronics
Graphite
Graphene
graphene
electronics
Gate dielectrics
Field effect transistors
field effect transistors
Sandwich structures
sandwich structures
Mechanical stability
Tensile strain
Carrier mobility
fracturing
retaining
carrier mobility
Leakage currents
fixing
Transparency
sliding

Keywords

  • Bending
  • CVD graphene
  • Field effect transistor
  • Flexible and transparent
  • Sandwiched fluorinated graphene
  • Strain

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Robust sandwiched fluorinated graphene for highly reliable flexible electronics. / Sahoo, Mamina; Wang, Jer Chyi; Nishina, Yuta; Liu, Zhiwei; Bow, Jong Shing; Lai, Chao Sung.

In: Applied Surface Science, Vol. 499, 143839, 01.01.2020.

Research output: Contribution to journalArticle

Sahoo, Mamina ; Wang, Jer Chyi ; Nishina, Yuta ; Liu, Zhiwei ; Bow, Jong Shing ; Lai, Chao Sung. / Robust sandwiched fluorinated graphene for highly reliable flexible electronics. In: Applied Surface Science. 2020 ; Vol. 499.
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