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Chemical Papers

, Volume 72, Issue 7, pp 1685–1695 | Cite as

Negative field-dependent charge mobility in crystalline organic semiconductors with delocalized transport

  • Andrey Kadashchuk
  • Robby Janneck
  • Fei Tong
  • Ivan I. Fishchuk
  • Alexander Mityashin
  • Egon Pavlica
  • Anna Köhler
  • Paul Heremans
  • Cedric Rolin
  • Gvido Bratina
  • Jan Genoe
Original Paper

Abstract

Charge-carrier mobility has been investigated by time-of-flight (TOF) transient photocurrent in a lateral transport configuration in highly crystalline thin films of 2,7-dioctyl[1]benzothieno [3,2-b][1] benzothiophene (C8-BTBT) grown by a zone-casting alignment technique. High TOF mobility has been revealed that it is consistent with the delocalized nature of the charge transport in this material, yet it featured a positive temperature dependence at \( T \ge 295\,{\text{K}} \). Moreover, the mobility was surprisingly found to decrease with electric field in the high-temperature region. These observations are not compatible with the conventional band-transport mechanism. We have elaborated an analytic model based on effective-medium approximation to rationalize the puzzling findings. The model considers the delocalized charge transport within the energy landscape formed by long-range transport band-edge variations in imperfect organic crystalline materials and accounts for the field-dependent effective dimensionality of charge transport percolative paths. The results of the model calculations are found to be in good agreement with experimental data.

Keywords

Organic semiconductors Thin crystalline films C8-BTBT Time-of-flight mobility Delocalized charge transport Electric field dependence of mobility Effective-medium approximation 

Notes

Acknowledgements

The authors gratefully acknowledge Nippon Kayaku Co. for providing C8-BTBT for this study. This research was supported by the Slovenian Research Agency and the Belgian FWO in the framework of the international collaboration project ORSIC-HIMA (Project No. N1-0024/G0B5914 N), by the European Research Council via Grant No. 320680 (EPOS CRYSTALLI), and by the Volkswagen Foundation through the project “Understanding the dependence of charge transport on morphology in organic semiconductor films”.

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  • Andrey Kadashchuk
    • 1
    • 2
  • Robby Janneck
    • 1
    • 3
  • Fei Tong
    • 4
  • Ivan I. Fishchuk
    • 2
    • 5
  • Alexander Mityashin
    • 1
  • Egon Pavlica
    • 4
  • Anna Köhler
    • 6
  • Paul Heremans
    • 1
    • 3
  • Cedric Rolin
    • 1
  • Gvido Bratina
    • 4
  • Jan Genoe
    • 1
    • 3
  1. 1.IMECLeuvenBelgium
  2. 2.Institute of PhysicsNational Academy of Sciences of UkraineKievUkraine
  3. 3.KULeuven, ESATLeuvenBelgium
  4. 4.Laboratory of Organic Matter PhysicsUniversity of Nova GoricaNova GoricaSlovenia
  5. 5.Institute for Nuclear ResearchNational Academy of Sciences of UkraineKievUkraine
  6. 6.Experimental Physics II and Bayreuth Institute of Macromolecular Research (BIMF)University of BayreuthBayreuthGermany

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