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Mobility-dependent charge injection into an organic semiconductor.

Y Shen1, M W Klein, D B Jacobs

  • 1Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853-1503, USA.

Physical Review Letters
|May 1, 2001
PubMed
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Charge injection from indium tin oxide (ITO) into organic semiconductors is limited by the ITO contact itself. This contact restricts current flow regardless of the organic material's hole mobility.

Area of Science:

  • Organic electronics
  • Materials science
  • Semiconductor physics

Background:

  • Indium tin oxide (ITO) is a common transparent conductive electrode.
  • Understanding charge injection is crucial for organic electronic device performance.

Purpose of the Study:

  • To investigate charge injection from ITO into organic semiconductors.
  • To determine the relationship between contact properties and organic semiconductor mobility.

Main Methods:

  • Measured injected current as a function of hole mobility.
  • Varied hole mobility by adjusting TPD concentration in PC:TPD.
  • Utilized indium tin oxide (ITO) as the charge injection electrode.

Main Results:

Related Experiment Videos

  • Injected current is directly proportional to the bulk hole mobility.
  • The ITO/PC:TPD contact was identified as the current-limiting factor.
  • Contact limitation was observed across all tested hole mobility values.

    • Conclusions:

    • The ITO/organic semiconductor interface is a critical bottleneck for charge injection.
    • Device performance in organic electronics may be significantly improved by optimizing electrode-semiconductor interfaces.