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Electrical current switching in single CdSe nanorods.

Hadar Steinberg1, Omri Wolf, Adam Faust

  • 1Institute of Chemistry, The Hebrew University, Jerusalem, Israel.

Nano Letters
|May 29, 2010
PubMed
Summary
This summary is machine-generated.

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Electrical current in cadmium selenide (CdSe) nanorods shows multistability, similar to fluorescence blinking. This behavior is linked to surface charge dynamics and can be modeled by single surface trap charging, enabling nanoscale charge sensing.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Colloidal semiconductor nanorods, such as cadmium selenide (CdSe), often exhibit intermittent behavior in their optical and electrical properties.
  • This phenomenon, known as intermittency or blinking, is frequently attributed to surface charge dynamics and trapping/detrapping events.

Purpose of the Study:

  • To investigate the relationship between electrical current switching and surface charge dynamics in individual CdSe nanorods.
  • To quantitatively establish the link between current multistability and charge dynamics.
  • To develop a nanoscale sensing methodology for surface charge dynamics.

Main Methods:

  • Electrical current measurements were performed on individually wired colloidal CdSe nanorods.

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  • Analysis of current-voltage characteristics to understand switching behavior.
  • Quantitative modeling of sojourn time distributions in different current states.
  • Estimation of surface trap positions from intermittent current-voltage data.

    • Main Results:

    • Pronounced multistability was observed in electrical current measurements of CdSe nanorods.
    • The current switching behavior was found to be analogous to fluorescence intermittency.
    • Quantitative association between current bistability and surface charge dynamics was established, with sojourn times following exponential dependence.
    • A model based on single surface trap charging dynamics successfully explained the observed behavior.

    Conclusions:

    • Electrical current multistability in CdSe nanorods is quantitatively linked to surface charge dynamics.
    • The intermittent current-voltage characteristics can be modeled by the charging dynamics of a single surface trap.
    • This work presents a novel nanoscale sensing approach for monitoring charge dynamics directly via the nanorod's own electrical response.