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, Kvantkomponentfysik
Kyung Ho Kim
Seoul National University
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Andrey Danilov
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Domenico Montemurro
Chalmers, Mikroteknologi och nanovetenskap
Liyang Yu
Chalmers, Kemi och kemiteknik, Tillämpad kemi
YungWoo Park
Seoul National University
University of Pennsylvania
Floriana Lombardi
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Thilo Bauch
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Kasper Moth-Poulsen
Chalmers, Kemi och kemiteknik, Tillämpad kemi
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
Sergey Kubatkin
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Samuel Lara Avila
National Physical Laboratory (NPL)
Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik
Nature Communications
2041-1723 (ISSN) 20411723 (eISSN)
Vol. 9 1 3956Ämneskategorier
Oorganisk kemi
Materialkemi
Den kondenserade materiens fysik
DOI
10.1038/s41467-018-06352-5
PubMed
30262825