title: Layered distribution of charge carriers in organic thin film transistors.
abstract: Drain-source current in organic thin-film transistors has been monitored in situ and in real time during the deposition of pentacene. The current starts to flow when percolation of the first monolayer (ML) occurs and, depending on the deposition rate, saturates at a coverage in the range 2-7 MLs. The number of active layers contributing to the current and the spatial distribution of charge carriers are modulated by the growth mode. The thickness of the accumulation layer, represented by an effective Debye length, scales as the morphological correlation length. These results show that the effective Debye length is not just a material parameter, but depends on the multiscale morphology. Earlier controversial results can be unified within this framework.
authors.affiliation: Consiglio Nazionale delle Ricerche-Istituto per lo Studio dei Materiali Nanostrutturati, Via P. Gobetti 101, 40129 Bologna, Italy.
authors.forename: Arian
authors.initials: A
authors.lastname: Shehu
authors.forename: Santiago D
authors.initials: SD
authors.lastname: Quiroga
authors.forename: Pasquale
authors.initials: P
authors.lastname: D'Angelo
authors.forename: Cristiano
authors.initials: C
authors.lastname: Albonetti
authors.forename: Francesco
authors.initials: F
authors.lastname: Borgatti
authors.forename: Mauro
authors.initials: M
authors.lastname: Murgia
authors.forename: Andrea
authors.initials: A
authors.lastname: Scorzoni
authors.forename: Pablo
authors.initials: P
authors.lastname: Stoliar
authors.forename: Fabio
authors.initials: F
authors.lastname: Biscarini