$f^{-γ}$ Current Fluctuations in Organic Semiconductors: Evidence for Percolation

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dc.creatorCarbone, A.
dc.creatorKotowska, B. K.
dc.creatorKotowski, D.
dc.date2006-01-18
dc.date.accessioned2026-07-07T12:54:20Z
dc.date.available2026-07-07T12:54:20Z
dc.descriptionThe $f^{-γ}$ 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.
dc.description11 pages, 2 figures, to appear on European Physical Journal B
dc.identifierhttps://arxiv.org/abs/cond-mat/0601418
dc.identifierhttp://arxiv.org/abs/cond-mat/0601418
dc.identifierThe European Physical Journal B 50 1-2 (2006) 77-81
dc.identifierdoi:10.1140/epjb/e2006-00146-5
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223896
dc.subjectDisordered Systems and Neural Networks
dc.subjectMaterials Science
dc.subjectStatistical Mechanics
dc.title$f^{-γ}$ Current Fluctuations in Organic Semiconductors: Evidence for Percolation
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