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Field and temperature dependent recombination in anthracene.

R H Batt, C L Braun, J F Hornig

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Quantum efficiency in anthracene photoconductivity is influenced by electric fields and temperature. A model suggests electron-hole pairs thermalize post-ionization, then separate or recombine, impacting free carrier generation.

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    Area of Science:

    • Solid-state physics
    • Photoconductivity studies
    • Organic semiconductor research

    Background:

    • Understanding charge carrier generation is crucial for organic electronics.
    • Anthracene is a model organic semiconductor for studying photoconductivity.
    • Previous models did not fully explain the observed dependencies.

    Purpose of the Study:

    • To investigate the quantum efficiency of photoconductivity in anthracene.
    • To elucidate the mechanisms of charge carrier generation and transport.
    • To develop a comprehensive model for photoconductivity in anthracene.

    Main Methods:

    • Experimental measurements of quantum efficiency under varying electric fields and temperatures.
    • Theoretical analysis based on charge carrier generation and recombination models.
    • Application of a Coulomb-field-influenced diffusion model.

    Main Results:

    • Quantum efficiency is dependent on electric field and temperature.
    • A model involving thermalized, Coulomb-bound electron-hole pairs explains the data.
    • Carrier separation or recombination is governed by Coulomb and applied fields.
    • Photon energy dependence suggests primary ionization involves energy relaxation and autoionization.

    Conclusions:

    • The proposed model accurately describes photoconductivity in anthracene.
    • Primary ionization in anthracene involves autoionization, not direct ionization.
    • This research provides insights into charge carrier dynamics in organic semiconductors.