Fabrication of single crystal field-effect transistors with phenacene-type molecules and their excellent transistor characteristics

Xuexia He, Ritsuko Eguchi, Hidenori Goto, Eri Uesugi, Shino Hamao, Yasuhiro Takabayashi, Yoshihiro Kubozono

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Single crystal field-effect transistors (FETs) using [6]phenacene and [7]phenacene show p-channel FET characteristics. Field-effect mobilities, μs, as high as 5.6 × 10-1 cm2 V-1 s -1 in a [6]phenacene single crystal FET with an SiO2 gate dielectric and 2.3 cm2 V-1 s-1 in a [7]phenacene single crystal FET were recorded. In these FETs, 7,7,8,8-tetracyanoquinodimethane (TCNQ) was inserted between the Au source/drain electrodes and the single crystal to reduce hole-injection barrier heights. The μ reached 3.2 cm2 V-1 s-1 in the [7]phenacene single crystal FET with a Ta2O5 gate dielectric, and a low absolute threshold voltage |VTH| (6.3 V) was observed. Insertion of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) in the interface produced very a high μ value (4.7-6.7 cm2 V-1 s-1) in the [7]phenacene single crystal FET, indicating that F4TCNQ was better for interface modification than TCNQ. A single crystal electric double-layer FET provided μ as high as 3.8 × 10-1 cm2 V-1 s-1 and |VTH| as low as 2.3 V. These results indicate that [6]phenacene and [7]phenacene are promising materials for future practical FET devices, and in addition we suggest that such devices might also provide a research tool to investigate a material's potential as a superconductor and a possible new way to produce the superconducting state.

Original languageEnglish
Pages (from-to)1673-1682
Number of pages10
JournalOrganic Electronics
Volume14
Issue number6
DOIs
Publication statusPublished - Jun 2013

Keywords

  • Field-effect transistor
  • Interface control
  • Ionic liquids
  • Phenacene molecule
  • Single crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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