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

Titelangaben

Kadashchuk, Andrey ; Janneck, Robby ; Tong, Fei ; Fishchuk, Ivan I. ; Mityashin, Alexander ; Pavlica, Egon ; Köhler, Anna ; Heremans, Paul ; Rolin, Cedric ; Bratina, Gvido ; Genoe, Jan:
Negative field-dependent charge mobility in crystalline organic semiconductors with delocalized transport.
In: Chemical Papers. Bd. 72 (2018) Heft 7 . - S. 1685-1695.
ISSN 1336-9075
DOI: https://doi.org/10.1007/s11696-018-0483-x

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≥295K. 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.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Organic semiconductors; Thin crystalline films; C8-BTBT; Time-of-flight mobility; Delocalized charge transport; Electric field dependence of mobility; Effective-medium approximation
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 29 Aug 2018 06:52
Letzte Änderung: 29 Aug 2018 06:52
URI: https://eref.uni-bayreuth.de/id/eprint/45607