Uniform doping of graphene close to the Dirac point by polymer-assisted assembly of molecular dopants
Journal article, 2018

Tuning the charge carrier density of two-dimensional (2D) materials by incorporating dopants into the crystal lattice is a challenging task. An attractive alternative is the surface transfer doping by adsorption of molecules on 2D crystals, which can lead to ordered molecular arrays. However, such systems, demonstrated in ultra-high vacuum conditions (UHV), are often unstable in ambient conditions. Here we show that air-stable doping of epitaxial graphene on SiC—achieved by spin-coating deposition of 2,3,5,6-tetrafluoro-tetracyano-quino-dimethane (F4TCNQ) incorporated in poly(methyl-methacrylate)—proceeds via the spontaneous accumulation of dopants at the graphene-polymer interface and by the formation of a charge-transfer complex that yields low-disorder, charge-neutral, large-area graphene with carrier mobilities ~70 000 cm2V−1s−1at cryogenic temperatures. The assembly of dopants on 2D materials assisted by a polymer matrix, demonstrated by spin-coating wafer-scale substrates in ambient conditions, opens up a scalable technological route toward expanding the functionality of 2D materials.

Author

Hans He

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Kyung Ho Kim

Seoul National University

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Andrey Danilov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Domenico Montemurro

Chalmers, Microtechnology and Nanoscience (MC2)

Liyang Yu

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

YungWoo Park

Seoul National University

University of Pennsylvania

Floriana Lombardi

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Kasper Moth-Poulsen

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Kasper Moth-Poulsen Group

Tihomir Iakimov

Linköping University

Rositsa Yakimova

Linköping University

Per Malmberg

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Christian Müller Group

Sergey Kubatkin

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Samuel Lara Avila

National Physical Laboratory (NPL)

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Nature Communications

2041-1723 (ISSN)

Vol. 9 1 3956

Subject Categories

Inorganic Chemistry

Materials Chemistry

Condensed Matter Physics

DOI

10.1038/s41467-018-06352-5

PubMed

30262825

More information

Latest update

12/10/2018