{
  "id": "1908.06913",
  "version": "v1",
  "published": "2019-08-19T16:22:33.000Z",
  "updated": "2019-08-19T16:22:33.000Z",
  "title": "Light emission from the layered metal 2H-TaSe$_2$ and its potential applications",
  "authors": [
    "Mehak Mahajan",
    "Sangeeth Kallatt",
    "Medha Dandu",
    "Naresh Sharma",
    "Shilpi Gupta",
    "Kausik Majumdar"
  ],
  "journal": "Communications Physics, Volume 2, Article number 88, 2019",
  "doi": "10.1038/s42005-019-0190-0",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Conventional metals, in general, do not exhibit strong photoluminescence. 2H-TaSe$_2$ is a layered transition metal dichalcogenide that possesses metallic property with charge density wave characteristics. Here we show that 2H-TaSe$_2$ exhibits a surprisingly strong optical absorption and photoluminescence resulting from inter-band transitions. We use this perfect combination of electrical and optical properties in several optoelectronic applications. We show a seven-fold enhancement in the photoluminescence intensity of otherwise weakly luminescent multi-layer MoS$_2$ through non-radiative resonant energy transfer from TaSe$_2$ transition dipoles. Using a combination of scanning photocurrent and time-resolved photoluminescence measurements, we also show that the hot electrons generated by light absorption in TaSe$_2$ have a rather long lifetime unlike conventional metals, making TaSe$_2$ an excellent hot electron injector. Finally, we show a vertical TaSe$_2$/MoS$_2$/graphene photodetector demonstrating a responsivity of $>10$ AW$^{-1}$ at $0.1$ MHz - one of the fastest reported photodetectors using MoS$_2$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-08-19T16:22:33.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "layered metal 2h-tase",
      "potential applications",
      "light emission",
      "long lifetime unlike conventional metals",
      "photoluminescence"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Nature"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}