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Title:Negative field‐dependent charge mobility in crystalline organic semiconductors with delocalized transport
Authors:Tong, Fei (Author)
Kadashchuk, Andrey (Author)
Pavlica, Egon (Author)
Bratina, Gvido (Author)
et al.
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology: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
COBISS_ID:5147899 Link is opened in a new window
URN:URN:SI:UNG:REP:CC4S2MA2
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

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

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Funding Programme:Sofinanciranje znanstvenoraziskovalnega sodelovanja med RS in Dansko
Project no.:N1-0024
Name:Organski monokristali za aplikacije z visoko gibljivostjo
Acronym:
Project ID:info:eu-repo/grantAgreement/ARRS/Sofinanciranje%20znanstvenoraziskovalnega%20sodelovanja%20med%20RS%20in%20Dansko/N1-0024

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