{
  "id": "cond-mat/0601418",
  "version": "v1",
  "published": "2006-01-18T17:32:43.000Z",
  "updated": "2006-01-18T17:32:43.000Z",
  "title": "$f^{-γ}$ Current Fluctuations in Organic Semiconductors: Evidence for Percolation",
  "authors": [
    "A. Carbone",
    "B. K. Kotowska",
    "D. Kotowski"
  ],
  "comment": "11 pages, 2 figures, to appear on European Physical Journal B",
  "journal": "The European Physical Journal B 50 1-2 (2006) 77-81",
  "doi": "10.1140/epjb/e2006-00146-5",
  "categories": [
    "cond-mat.dis-nn",
    "cond-mat.mtrl-sci",
    "cond-mat.stat-mech"
  ],
  "abstract": "The $f^{-\\gamma}$ sloped current noise power spectra, observed in organic semiconductors, have been interpreted within a {\\em variable range hopping} mechanism of the fluctuations. The relative current noise power spectral density ${\\cal S}(f)=S_I(f)/I^2$ exhibits a maximum at the {\\em trap-filling transition} between the {\\em ohmic} and the {\\em space-charge-limited-current} regime [Phys. Rev. Lett., {\\bf 95}, 236601, 2005]. Here, we discuss the electronic conditions determining the crossover from ohmic to space-charge-limited transport. These arguments shed further light on the need to adopt a {\\em percolative} fluctuation picture to account for the competition between insulating and conductive phases coexisting at the {\\em transition}, where small changes in the external bias lead to dramatic effects in the fluctuations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2006-01-18T17:32:43.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "72.70.+m",
      "72.80.Le"
    ],
    "keywords": [
      "organic semiconductors",
      "current fluctuations",
      "current noise power spectral density",
      "sloped current noise power spectra",
      "relative current noise power spectral"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "European Physical Journal B",
      "year": 2006,
      "month": "Mar",
      "volume": 50,
      "number": "1-2",
      "pages": 77
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2006EPJB...50...77C"
    }
  }
}