{
  "id": "1805.05644",
  "version": "v1",
  "published": "2018-05-15T08:51:39.000Z",
  "updated": "2018-05-15T08:51:39.000Z",
  "title": "Uniform doping of graphene close to the charge neutrality point by polymer-assisted spontaneous assembly of molecular dopants",
  "authors": [
    "Hans He",
    "Kyung Ho Kim",
    "Andrey Danilov",
    "Domenico Montemurro",
    "Liyang Yu",
    "Yung Woo Park",
    "Floriana Lombardi",
    "Thilo Bauch",
    "Kasper Moth-Poulsen",
    "Tihomir Iakimov",
    "Rositsa Yakimova",
    "Per Malmberg",
    "Christian Müller",
    "Sergey Kubatkin",
    "Samuel Lara-Avila"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "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 graphene with carrier mobilities ~70,000 cm2/Vs at 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 towards expanding the functionality of 2D materials.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-05-15T08:51:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "charge neutrality point",
      "graphene close",
      "polymer-assisted spontaneous assembly",
      "molecular dopants",
      "uniform doping"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}