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 journalArticlepeer-review

    25 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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