Voltage-modulated millimeter-wave spectroscopy on a polymer diode: Mesoscopic charge transport in conjugated polymers - art. no. 086601

We present a new technique to determine the carrier mobility mu in semicond ucting, undoped, conjugated polymers in the millimeter-wave frequency range . 10-500 GHz. This method probes charge conduction on mesoscopic length sca les, a regime inaccessible to other transport experiments. The experiment i s based on the detection of millimeter-wave absorption of field-induced cha rge in polymer diodes, and is applied to poly( p-phenylene vinylene). We de monstrate that locally mu can be as high as 10(-4) m(2)/Vs, and deduce the typical hopping parameters in the mesoscopic high-mu regions in the materia l.