Raman imaging of carrier distribution in the channel of an ionic liquid-gated transistor fabricated with regioregular poly(3-hexylthiophene)

Y. Wada, I. Enokida, J. Yamamoto, Yukio Furukawa

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    3 Citations (Scopus)

    Abstract

    Raman images of carriers (positive polarons) at the channel of an ionic liquid-gated transistor (ILGT) fabricated with regioregular poly(3-hexylthiophene) (P3HT) have been measured with excitation at 785 nm. The observed spectra indicate that carriers generated are positive polarons. The intensities of the 1415 cm−1 band attributed to polarons in the P3HT channel were plotted as Raman images; they showed the carrier density distribution. When the source–drain voltage VD is lower than the source–gate voltage VG (linear region), the carrier density was uniform. When VD is nearly equal to VG (saturation region), a negative carrier density gradient from the source electrode towards the drain electrode was observed. This carrier density distribution is associated with the observed current–voltage characteristics, which is not consistent with the “pinch-off” theory of inorganic semiconductor transistors.

    Original languageEnglish
    Pages (from-to)166-169
    Number of pages4
    JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
    Volume197
    DOIs
    Publication statusPublished - 2018 May 15

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    Keywords

    • Carrier
    • Chemical imaging
    • Ionic liquid
    • Organic transistor
    • Poly(3-hexylthiophene)
    • Raman imaging

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Atomic and Molecular Physics, and Optics
    • Instrumentation
    • Spectroscopy

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