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Related Experiment Videos

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
Summary
This summary is machine-generated.

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.

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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:

  • 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.