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Related Experiment Videos

Charge recombination in CuPc/PTCDA thin films.

S Heutz1, A F Nogueira, J R Durrant

  • 1Centre for Electronic Materials and Devices, Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom. s.heutz@ucl.ac.uk

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary
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Charge carrier recombination in organic semiconductors like PTCDA and CuPc follows power law dynamics due to polaron trapping. This behavior is similar across different materials, suggesting a general mechanism in organic electronics.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Organic Electronics

Background:

  • Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and copper phthalocyanine (CuPc) are key organic semiconductors.
  • Understanding charge carrier recombination is crucial for organic electronic device efficiency.

Purpose of the Study:

  • To investigate the recombination kinetics of photogenerated charge carriers in PTCDA and CuPc thin films.
  • To elucidate the mechanisms governing charge carrier recombination dynamics.

Main Methods:

  • Thin films of PTCDA and CuPc were grown using organic molecular beam deposition.
  • Transient absorption spectroscopy was employed to study recombination dynamics from microseconds to milliseconds.

Main Results:

Related Experiment Videos

  • Long-lived polaron states were generated upon optical excitation.
  • Power law recombination dynamics were observed, attributed to polaron trapping in localized states.
  • An estimated trap state density of ~6 x 10^17 polarons cm^-3 was determined.

Conclusions:

  • The observed power law recombination is driven by polaron trapping in PTCDA films.
  • This recombination behavior is similar to that in polymer/fullerene blends, indicating a generic mechanism in organic semiconductors.