Issue 10, 2024

Defect healing and doping of CVD graphene by thermal sulfurization

Abstract

CVD graphene layers are intrinsically polycrystalline; depending on grain size, their structure at the atomic level is scarcely free of defects, which affects the properties of graphene. On the one hand, atomic-scale defects act as scattering centers and lead to a loss of carrier mobility. On the other hand, structural disorder at grain boundaries provides additional resistance in series that affects material conductivity. Graphene chemical functionalization has been demonstrated to be an effective way to improve its conductivity mainly by increasing carrier concentration. The present study reports the healing effects of sulfur doping on the electrical transport properties of single-layer CVD graphene. A post-growth thermal sulfurization process operating at 250 °C is applied on single layers of graphene on Corning-glass and Si/SiO2 substrates. XPS and Raman analyses reveal the covalent attachment of sulfur atoms in graphene carbon lattice without creating new C-sp3 defects. Measurements of transport properties show a significant improvement in hole mobility as revealed by Hall measurements and related material conductivity. Typically, Hall mobility values as high as 2500 cm2 V−1 s−1 and sheet resistance as low as 400 Ohm per square are measured on single-layer sulfurized graphene.

Graphical abstract: Defect healing and doping of CVD graphene by thermal sulfurization

Supplementary files

Article information

Article type
Paper
Submitted
09 Feb 2024
Accepted
06 Apr 2024
First published
09 Apr 2024
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2024,6, 2629-2635

Defect healing and doping of CVD graphene by thermal sulfurization

G. V. Bianco, A. Sacchetti, A. Milella, M. M. Giangregorio, S. Dicorato and G. Bruno, Nanoscale Adv., 2024, 6, 2629 DOI: 10.1039/D4NA00124A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements