Graphene Field-Effect Transistor on a Calcium Fluoride Substrate

Tuan Khanh Chau, Dongseok Suh

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We report the electrical-transport properties of a monolayer graphene device put on a 500 µm-thick calcium fluoride (CaF2) single-crystal substrate. From the gate-voltage dependence, clear n-type behavior was observed in a graphene/CaF2 field-effect transistor. This can be understood on the basis of the strong interaction between graphene and the CaF2 substrate, where the substantial electron wavefunction overlap between graphene and fluorine atoms of CaF2 occurs. This observation indicates that the strong n-type doping to graphene is possible only through the contact of graphene with the fluorinated substrate due to the strong electron affinity of a fluorine atom. Various electrical and optical characterizations for the graphene on CaF2 substrates are provided.

Original languageEnglish
Pages (from-to)879-883
Number of pages5
JournalJournal of the Korean Physical Society
Volume77
Issue number10
DOIs
StatePublished - Nov 2020

Bibliographical note

Funding Information:
This study was supported by the Korea Electric Power Corporation (No. R18XA06-54), and the Global Research & Development Center Program (No. 2018K1A4A3A01064272) through the NRF funded by the Ministry of Science and ICT, Republic of Korea.

Publisher Copyright:
© 2020, The Korean Physical Society.

Keywords

  • CaF
  • CVD graphene
  • Dielectric constant
  • Electrical transport
  • Field effect transistor

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