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Title:Molecular alignment on graphene surface determines transport properties of graphene/organic semiconductor transistors
Authors:ID Tkachuk, Vadym, UNG (Author)
ID Pavlica, Egon, UNG (Author)
ID Bratina, Gvido, UNG (Author)
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Graphene field-effect transistor structures were used to investigate the role of molecular alignment on charge transport properties of heterostructures comprising a single-layer graphene and variable thickness of N,N′-bis(n-octyl)-(1,7&1,6)-dicyanoperylene-3,4:9,10-bisdicarboximide (PDI8-CN2) - an n-type organic semiconductor. Our atomic force microscopy data show that under selected growth conditions PDI8-CN2 grows in a layer-by-layer fashion up to a second monolayer. The first layer comprises flat-lying molecules, whereas the molecules in the second layer orient themselves in an upright orientation. Transconductance measurements show that the flat-lying molecules have little effect on the position of the Fermi level in graphene. Upright oriented molecules in the second layer instead, have a strong effect as to neutralize native p-type doping of graphene and cause a shift of charge-neutrality level towards the Dirac point. We interpret such behavior in terms of different orientation of the surface dipole on layers with different molecular orientations. At the same time the overall mobility of the charge carriers reaches values exceeding 3000 cm2/Vs.
Keywords:organski polprevodniki, grafen, transport električnega naboja
Publication version:Version of Record
Year of publishing:2020
Number of pages:7
Numbering:87, 105933
PID:20.500.12556/RUNG-5885 New window
COBISS.SI-ID:32240131 New window
DOI:10.1016/j.orgel.2020.105933 New window
NUK URN:URN:SI:UNG:REP:RPMDSL39
Publication date in RUNG:13.10.2020
Views:3883
Downloads:0
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TKACHUK, Vadym, PAVLICA, Egon and BRATINA, Gvido, 2020, Molecular alignment on graphene surface determines transport properties of graphene/organic semiconductor transistors. Organic Electronics [online]. 2020. Vol. 87, no. 105933. [Accessed 26 March 2025]. DOI 10.1016/j.orgel.2020.105933. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=5885
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Record is a part of a journal

Title:Organic Electronics
Year of publishing:2020

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0055

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:13.10.2020

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