title: Electron transport characteristics in nanosegregated columnar phases of perylene tetracarboxylic bisimide derivatives bearing oligosiloxane chains.
abstract: Electron transport characteristics in nanosegregated columnar phases of perylene tetracarboxylic bisimide (PTCBI) derivatives bearing oligosiloxane chains are studied over wide temperature ranges using a time-of-flight (TOF) method. In the ordered columnar phases of the PTCBI derivatives bearing disiloxane chains, the electron mobilities exceed 0.1 cm(2) V(-1) s(-1) at room temperature. In the disordered columnar phase of the PTCBI derivative bearing trisiloxane chains, the electron mobility reaches the order of 10(-3) cm(2) V(-1) s(-1) at around room temperature. These electron mobilities are temperature-independent at around room temperature. However, their dependence upon the electric field becomes larger when the temperature is lowered below room temperature; this behavior is described by a hopping transport mechanism. The experimental results are analyzed using a one-dimensional disorder model.
authors.affiliation: 2217-20 Hayashi-cho, Takamatsu, Kagawa 761-0396, Japan. m-funa@eng.kagawa-u.ac.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Funahashi
authors.forename: Akinari
authors.initials: A
authors.lastname: Sonoda