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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2018-07

AUTHORS

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

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. More... »

PAGES

1685-1695

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11696-018-0483-x

DOI

http://dx.doi.org/10.1007/s11696-018-0483-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103764203


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