Broadband characterization of charge carrier transfer of hybrid graphene-deoxyribonucleic acid junctions

Chaehyun Lim, Sang Hun Lee, Youngmo Jung, Joo Hiuk Son, Jong Ho Choe, Young June Kim, Jaebin Choi, Sukang Bae, Jae Hun Kim, Robert H. Blick, Minah Seo, Chulki Kim

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The charge transfer dynamics regarding an intimate contact between graphene and single-stranded deoxyribonucleic acid (ssDNA) is investigated from DC to the THz-regime. A graphene field-effect transistor (G-FET) is immersed in ssDNA solutions where the adsorption of ssDNA is controlled in terms of absolute coverage. DC-response of the G-FET is recorded and cross-validated by observing changes in Raman spectroscopy and further investigating THz-time domain spectroscopy using a nano-slot antenna. We find very good agreement between electrical and optical approaches where the Fermi level of the ssDNA-adsorbed graphene depends on the coverage nonlinearly. The results point towards a new doping method with sub-nanoscale patterning precision on graphene and its electronic applications based on electronic junction properties.

Original languageEnglish
Pages (from-to)525-531
Number of pages7
JournalCarbon
Volume130
DOIs
StatePublished - Apr 2018

Keywords

  • DNA
  • Fermi level
  • G-FET
  • Graphene
  • Terahertz

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