{
  "id": "2102.06370",
  "version": "v1",
  "published": "2021-02-12T07:18:49.000Z",
  "updated": "2021-02-12T07:18:49.000Z",
  "title": "Accurate Extraction of Schottky Barrier Height and Universality of Fermi Level De-pinning of van der Waals Contacts",
  "authors": [
    "Krishna Murali",
    "Medha Dandu",
    "Kenji Watanabe",
    "Takashi Taniguchi",
    "Kausik Majumdar"
  ],
  "journal": "Advanced Functional Materials, 2021",
  "doi": "10.1002/adfm.202010513",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci",
    "physics.app-ph"
  ],
  "abstract": "Due to Fermi level pinning (FLP), metal-semiconductor contact interfaces result in a Schottky barrier height (SBH), which is usually difficult to tune. This makes it challenging to efficiently inject both electrons and holes using the same metal - an essential requirement for several applications, including light-emitting devices and complementary logic. Interestingly, modulating the SBH in the Schottky-Mott limit of de-pinned van der Waals (vdW) contacts becomes possible. However, accurate extraction of the SBH is essential to exploit such contacts to their full potential. In this work, we propose a simple technique to accurately estimate the SBH at the vdW contact interfaces by circumventing several ambiguities associated with SBH extraction. Using this technique on several vdW contacts, including metallic 2H-TaSe$_2$, semi-metallic graphene, and degenerately doped semiconducting SnSe$_2$, we demonstrate that vdW contacts exhibit a universal de-pinned nature. Superior ambipolar carrier injection properties of vdW contacts are demonstrated (with Au contact as a reference) in two applications, namely, (a) pulsed electroluminescence from monolayer WS$_2$ using few-layer graphene (FLG) contact, and (b) efficient carrier injection to WS$_2$ and WSe$_2$ channels in both nFET and pFET modes using 2H-TaSe$_2$ contact.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-02-12T07:18:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "van der waals contacts",
      "schottky barrier height",
      "accurate extraction",
      "fermi level de-pinning",
      "vdw contact"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}