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

[Person c9ca7338-39ce-44dd-8228-f50c10d52c37 not found]

[Person f4bfa6cc-2eb9-43ed-9896-e5e8413b44d9 not found]

[Person 54efef21-9916-4fae-855b-e545b30f8a2b not found]

[Person d4c0fe66-0f2c-4d20-bafe-afdc4901ecc8 not found]

[Person 3277e48b-7197-4ebf-8301-89e4b163e2a7 not found]

[Person 63b34704-21fa-4a10-8454-fa6f11dfcdb5 not found]

[Person e3d71f5c-4cac-4e2e-a51b-e35d7a49b44b not found]

[Person 4aed0637-71bf-4b4d-afd1-e22ee210ef1d not found]

[Person 87916476-7e9c-4ccb-b633-d0dcc23db57a not found]

[Person 41f057f7-dc54-4eae-9ed1-dc610aec0216 not found]

[Person c7662c88-e7a6-444d-a6fa-df531cee784d not found]

[Person ee913871-6062-4ebf-b494-1dff9dc9f9de not found]

[Person aab67efa-f956-419c-ada1-45bcb6f2b9ad not found]

[Person 6e16ee3f-a5d0-4165-a25a-c07af11e049c not found]

[Person 6500575f-452e-4b3e-aa11-cbf26c6725a4 not found]

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