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Title:The role of charge transfer at reduced graphene oxide/organic semiconductor interface on the charge transport properties
Authors:Bratina, Gvido (Author)
Pavlica, Egon (Author)
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:The effect of 1-pyrenesulfonicacid sodium salt (1-PSA), tetracyanoethylene (TCNE) and tetrafluoro- tetracyanoquinodimethane (F4-TCNQ) on charge transport properties of reduced graphene oxide (RGO) is examined by measuring the transfer characteristics of field-effect transistors and co-planar time-of-flight photocurrent technique. Evidence of p-type doping and a reduction of mobility of electrons in RGO upon deposition of these materials is observed. Time-resolved photocurrent measurements show a reduction in elec- tron mobility even at submonolayer coverage of these materials. The variation of transit time with different coverages reveals that electron mobility decreases with increasing the surface coverage of 1-PSA, TCNE and F4- TCNQ to a certain extent, while at higher coverage the electron mobility is slightly recovered. All three molecules show the same trend in charge carrier mobility variation with coverage, but with different magnitude. Among all three molecules, 1-PSA acts as weak electron acceptor compared to TCNE and F4-TCNQ. The additional fluorine moieties in F4-TCNQ provides excellent electron withdrawing capability compared to TCNE. The experimental results are consistent with the density functional theory calculations.
Keywords:organic semiconductors, reduced graphene oxide, time-resolved photocurrent measurements, organic thin film transistors
Year of publishing:2019
Number of pages:7
Numbering:75
COBISS_ID:5473275 Link is opened in a new window
URN:URN:SI:UNG:REP:UFISCPAF
DOI:10.1016/j.orgel.2019.105499 Link is opened in a new window
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:Organic Electronics
Shortened title:org. el.
Year of publishing:2019

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Funding Programme:Raziskovalni projekti - temeljni
Project no.:P1-0051
Name:
Acronym:
Project ID:info:eu-repo/grantAgreement/ARRS/Raziskovalni%20projekti%20-%20temeljni/P1-0051

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