title: Suppression of Low-Frequency Electronic Noise in Polymer Nanowire Field-Effect Transistors.
abstract: The authors report on the reduction of low-frequency noise in semiconductor polymer nanowires with respect to thin-films made of the same organic material. Flicker noise is experimentally investigated in polymer nanowires in the range of 10-10(5) Hz by means of field-effect transistor architectures. The noise in the devices is well described by the Hooge empirical model and exhibits an average Hooge constant, which describes the current power spectral density of fluctuations, suppressed by 1-2 orders of magnitude compared to thin-film devices. To explain the Hooge constant reduction, a resistor network model is developed, in which the organic semiconducting nanostructures or films are depicted through a two-dimensional network of resistors with a square-lattice structure, accounting for the different anisotropy and degree of structural disorder of the active nanowires and films. Results from modeling agree well with experimental findings. These results support enhanced structural order through size-confinement in organic nanostructures as effective route to improve the noise performance in polymer electronic devices.
authors.affiliation: Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento , via Arnesano, I-73100 Lecce, Italy.|Center for Biomolecular Nanotechnologies at UNILE, Istituto Italiano di Tecnologia , Via Barsanti, I-73010 Arnesano (LE), Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Lezzi
authors.affiliation: Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano , Via Colombo 81, I-20133 Milano, Italy.
authors.forename: Giorgio
authors.initials: G
authors.lastname: Ferrari
authors.affiliation: Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento , via Arnesano, I-73100 Lecce, Italy.|Istituto Nazionale di Fisica Nucleare (INFN), Via Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Pennetta
authors.affiliation: Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento , via Arnesano, I-73100 Lecce, Italy.|Center for Biomolecular Nanotechnologies at UNILE, Istituto Italiano di Tecnologia , Via Barsanti, I-73010 Arnesano (LE), Italy.|Istituto Nanoscienze-CNR , Euromediterranean Center for Nanomaterial Modelling and Technology (ECMT), via Arnesano, I-73100 Lecce, Italy.
authors.forename: Dario
authors.initials: D
authors.lastname: Pisignano
keywords: Polymer nanowires; field-effect transistors; low-frequency noise; noise in nanostructures; soft nanolithography