Direct formation of solution-based Al2O3 on epitaxial graphene surface for sensor applications

Kwan Soo Kim, Hirokazu Fukidome, Maki Suemitsu

Research output: Contribution to journalArticlepeer-review


We propose a method for fabricating high-performance epitaxial graphene field-effect transistors (EG-FETs), involving a microwave-annealing-treated solution-based Al2O3 (MWA-treated sol-Al2O3) layer as a gate dielectric. The MWA process substantially preserves the pristine properties of EG with minimal hole doping and strain induction. The MWA-treated sol-Al2O3 showed a surface roughness of ~0.33 nm, a dielectric constant of 7.5, and a leakage current of 8.7 × 10−6 A/cm2. The transconductance of the MWA-based EG-FET presents an enhanced field effect mobility by a factor of about 8 compared with the EG-FET with a natural oxide of Al.

Original languageEnglish
Pages (from-to)2291-2301
Number of pages11
JournalSensors and Materials
Issue number7
Publication statusPublished - 2019


  • Epitaxial graphene
  • Microwave annealing
  • Sensor
  • Solution process

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)


Dive into the research topics of 'Direct formation of solution-based Al<sub>2</sub>O<sub>3</sub> on epitaxial graphene surface for sensor applications'. Together they form a unique fingerprint.

Cite this