Uniform doping of graphene close to the Dirac point by polymer-assisted assembly of molecular dopants
Artikel i vetenskaplig tidskrift, 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.

Författare

Hans He

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Kyung Ho Kim

Seoul National University

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Andrey Danilov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Domenico Montemurro

Chalmers, Mikroteknologi och nanovetenskap (MC2)

Liyang Yu

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Christian Müller Group

YungWoo Park

University of Pennsylvania

Seoul National University

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Kasper Moth-Poulsen

Kasper Moth-Poulsen Group

Tihomir Iakimov

Linköpings universitet

Rositsa Yakimova

Linköpings universitet

Per Malmberg

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Christian Müller Group

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Samuel Lara Avila

National Physical Laboratory (NPL)

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Nature Communications

2041-1723 (ISSN)

Vol. 9 1 3956

Ämneskategorier

Oorganisk kemi

Materialkemi

Den kondenserade materiens fysik

DOI

10.1038/s41467-018-06352-5

PubMed

30262825

Mer information

Senast uppdaterat

2018-10-18