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We report on the results of noise measurements in p-type organic thin-film transistors (TFTs) extending from the subthreshold region into the strong accumulation region over four decades of drain current values. The low-frequency noise produced by the devices can be successfully interpreted in the context of a multitrap correlated number fluctuation-mobility fluctuation (CMF) theory, while neither phonon-induced mobility fluctuation nor carrier number fluctuation mechanisms are capable of justifying the observed noise behavior. The Coulomb scattering parameter is found to be in the order of 107 Vs/C, about three orders of magnitude larger with respect to crystalline silicon MOSFETs and comparable with what already reported in hydrogenated amorphous silicon TFTs, suggesting a much more relevant contribution coming from CMF in disordered materials.
Publication date: 
5 Feb 2015

Gino Giusi, Orazio Giordano, Graziella Scandurra, Sabrina Calvi, Guglielmo Fortunato, Matteo Rapisarda, Luigi Mariucci, Carmine Ciofi

Biblio References: 
Volume: 36 Issue: 4 Pages: 390-392
IEEE Electron Device Letters