title: Nonlinear transport in semiconducting polymers at high carrier densities.
abstract: Conducting and semiconducting polymers are important materials in the development of printed, flexible, large-area electronics such as flat-panel displays and photovoltaic cells. There has been rapid progress in developing conjugated polymers with high transport mobility required for high-performance field-effect transistors (FETs), beginning with mobilities around 10(-4) cm(2) V(-1) s(-1) to a recent report of 1 cm(2) V(-1) s(-1) for poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT). Here, the electrical properties of PBTTT are studied at high charge densities both as the semiconductor layer in FETs and in electrochemically doped films to determine the transport mechanism. We show that data obtained using a wide range of parameters (temperature, gate-induced carrier density, source-drain voltage and doping level) scale onto the universal curve predicted for transport in the Luttinger liquid description of the one-dimensional 'metal'.
authors.affiliation: Center for Polymers and Organic Solids, University of California at Santa Barbara, Santa Barbara, California 93106, USA.
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Yuen
authors.forename: Reghu
authors.initials: R
authors.lastname: Menon
authors.forename: Nelson E
authors.initials: NE
authors.lastname: Coates
authors.forename: Ebinazar B
authors.initials: EB
authors.lastname: Namdas
authors.forename: Shinuk
authors.initials: S
authors.lastname: Cho
authors.forename: Scott T
authors.initials: ST
authors.lastname: Hannahs
authors.forename: Daniel
authors.initials: D
authors.lastname: Moses
authors.forename: Alan J
authors.initials: AJ
authors.lastname: Heeger