Egon Pavlica (Author), N. Pastukhova (Author), Robert A. Nawrocki (Author), Artur Ciesielski (Author), Vadym Tkachuk (Author), Paolo Samorì (Author), Gvido Bratina (Author)

Abstract

This paper describes a study on the charge transport in a composite of liquid‐exfoliated graphene nanoparticles (GNPs) and a polythiophene semiconducting polymer. While the former component is highly conducting, although it consists of isolated nanostructures, the latter offers an efficient charge transport path between the individual GNPs within the film, overall yielding enhanced charge transport properties of the resulting bi‐component system. The electrical characteristics of the composite layers were investigated by means of measurements of time‐of‐flight photoconductivity and transconductance in field‐effect transistors. In order to analyze both phenomena separately, charge density and charge mobility contributions to the conductivity were singled out. With the increasing GNP concentration, the charge mobility was found to increase, thereby reducing the time spent by the carriers on the polymer chains. In addition, for GNP loading above 0.2 % (wt.), an increase of free charge density was observed that highlights an additional key role played by doping. Variable‐range hopping model of a mixed two‐ and three‐dimensional transport is explained using temperature dependence of mobility and free charge density. The temperature variation of free charge density was related to the electron transfer from polythiophene to GNP, with an energy barrier of 24 meV.

Keywords

grafen;polimeri;transport električnega naboja;časovno odvisna fotoprevodnost;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UNG - University of Nova Gorica
UDC: 544
COBISS: 5439739 Link will open in a new window
ISSN: Y507-9152
Views: 2270
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Other data

URN: URN:SI:UNG
Type (COBISS): Not categorized
Pages: str. 1366-1374
Volume: ǂVol. ǂ84
Issue: ǂno. ǂ9
Chronology: 2019
DOI: 10.1002/cplu.201900219
ID: 11206433