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Related Experiment Videos

ZnO nanowire transistors.

Josh Goldberger, Donald J Sirbuly, Matt Law

    The Journal of Physical Chemistry. B
    |July 21, 2006
    PubMed
    Summary

    This study fabricated zinc oxide (ZnO) nanowire field-effect transistors (FETs), achieving high mobility in air. Performance is sensitive to surface species and exhibits a dynamic gate effect.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Semiconductor Physics

    Background:

    • Fabrication and characterization of n-type zinc oxide (ZnO) nanowire field-effect transistors (FETs).
    • Investigation of device performance across a temperature range (5–300 K) in vacuum and various ambient gases.

    Discussion:

    • Analysis of high carrier mobility (13 ± 5 cm²/V·s) and on-off ratios (10⁵–10⁷) in air, attributed to adsorbed surface species.
    • Evaluation of Ti/Au-ZnO contact resistivity (0.002–0.02 Ω·cm) using four-probe measurements.
    • Observation of a dynamic gate effect causing transconductance hysteresis, linked to mobile surface charges.

    Key Insights:

    • ZnO nanowire FETs demonstrate excellent performance metrics, rivaling previously reported values.
    • Device characteristics are significantly influenced by surface chemistry and adsorbed gas molecules.
    • A novel dynamic gate effect impacts transistor stability and operation.

    Outlook:

    • Potential for ZnO nanowire FETs in gas sensing applications due to surface sensitivity.
    • Further research into mitigating the dynamic gate effect for improved device reliability.
    • Exploration of surface functionalization strategies to tune FET performance.

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