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

Title data

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. Vol. 72 (2018) Issue 7 . - pp. 1685-1695.
ISSN 1336-9075
DOI: https://doi.org/10.1007/s11696-018-0483-x

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Organic semiconductors; Thin crystalline films; C8-BTBT; Time-of-flight mobility; Delocalized charge transport; Electric field dependence of mobility; Effective-medium approximation
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 29 Aug 2018 06:52
Last Modified: 29 Aug 2018 06:52
URI: https://eref.uni-bayreuth.de/id/eprint/45607