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Title:Negative field‐dependent charge mobility in crystalline organic semiconductors with delocalized transport
Authors:ID Tong, Fei (Author)
ID Kadashchuk, Andrey, IMEC (Author)
ID Pavlica, Egon, UNG (Author)
ID Bratina, Gvido, UNG (Author), et al.
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Charge-carrier mobility has been investigated by time-of-flight (TOF) transient photocurrent in a lateral transport con- figuration 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 ≥ 295 K. Moreover, the mobility was surprisingly found to decrease with electric field in the high-temperature region. These observations are not compat- ible 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:time of flight, organic semiconductors, single crystals
Year of publishing:2018
Number of pages:12
Numbering:73
PID:20.500.12556/RUNG-3921-d57bbada-1079-4c3d-7472-bf7227c6f241 New window
COBISS.SI-ID:5147899 New window
NUK URN:URN:SI:UNG:REP:CC4S2MA2
Publication date in RUNG:07.05.2018
Views:6750
Downloads:0
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TONG, Fei, KADASHCHUK, Andrey, PAVLICA, Egon and BRATINA, Gvido, 2018, Negative field‐dependent charge mobility in crystalline organic semiconductors with delocalized transport. Chemical Papers [online]. 2018. Vol. 73. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=3921
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Record is a part of a journal

Title:Chemical Papers
Publisher:Springer Verlag (Germany)
Year of publishing:2018
ISSN:0366-6352

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:N1-0024
Name:Organski monokristali za aplikacije z visoko gibljivostjo

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:07.05.2018

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