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

Povzetek

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.

Ključne besede

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

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UNG - Univerza v Novi Gorici
UDK: 544
COBISS: 5439739 Povezava se bo odprla v novem oknu
ISSN: Y507-9152
Št. ogledov: 2270
Št. prenosov: 0
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

URN: URN:SI:UNG
Vrsta dela (COBISS): Delo ni kategorizirano
Strani: str. 1366-1374
Letnik: ǂVol. ǂ84
Zvezek: ǂno. ǂ9
Čas izdaje: 2019
DOI: 10.1002/cplu.201900219
ID: 11206433