Title :

The Effect of C60 and Pentacene Adsorbates on the Electrical Properties of CVD Graphene on SiO2

Author(s) :

Oswald, Jacopo [Auteur]
Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
Beretta, Davide [Auteur]
Swiss Federal Laboratories for Materials Science and Technology [St Gallen] [EMPA]
Stiefel, Michael [Auteur]
IBM Research [Zurich]
Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
Furrer, Roman [Auteur]
Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]
Vuillaume, Dominique [Auteur]
Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Calame, Michel [Auteur]
Université de Bâle = University of Basel = Basel Universität [Unibas]
Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA]

Journal title :

Nanomaterials

Pages :

1134

Publisher :

MDPI

Publication date :

2023

ISSN :

2079-4991

English keyword(s) :

Organic semiconducteur
graphene
field effect transistor
van der Waals
C60
Pentacene
hybrid
heterostructures

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Sciences de l'ingénieur [physics]/Micro et nanotechnologies/Microélectronique

English abstract : [en]

Graphene is an excellent 2D material for vertical organic transistors electrodes due to its weak electrostatic screening and field-tunable work function, in addition to its high conductivity, flexibility and optical ...
Show more >Graphene is an excellent 2D material for vertical organic transistors electrodes due to its weak electrostatic screening and field-tunable work function, in addition to its high conductivity, flexibility and optical transparency. Nevertheless, the interaction between graphene and other carbon-based materials, including small organic molecules, can affect the graphene electrical properties and therefore, the device performances. This work investigates the effects of thermally evaporated C60 (n-type) and Pentacene (p-type) thin films on the in-plane charge transport properties of large area CVD graphene under vacuum. This study was performed on a population of 300 graphene field effect transistors. The output characteristic of the transistors revealed that a C60 thin film adsorbate increased the graphene hole density by (1.65 ± 0.36) × 1012 cm−2, whereas a Pentacene thin film increased the graphene electron density by (0.55 ± 0.54) × 1012 cm−2. Hence, C60 induced a graphene Fermi energy downshift of about 100 meV, while Pentacene induced a Fermi energy upshift of about 120 meV. In both cases, the increase in charge carriers was accompanied by a reduced charge mobility, which resulted in a larger graphene sheet resistance of about 3 kΩ at the Dirac point. Interestingly, the contact resistance, which varied in the range 200 Ω–1 kΩ, was not significantly affected by the deposition of the organic molecules.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Hétérostructures Van der Waals hybrides pour transistors organiques verticaux à base perméable.

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL