Dresden 2009 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: POSTERS Electronic and Optical Properties

CPP 40.4: Poster

Thursday, March 26, 2009, 17:00–19:30, P3

Increasing conjugated polymer film conductivity by charge transfer complexes — •Fatemeh Ghani¹, Jörn-Oliver Vogel¹, Georg Heimel¹, Jürgen P. Rabe¹, Norbert Koch¹, Seyfullah Yilmaz², Sybille Allard², and Ullrich Scherf² — ¹Institut f. Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — ²Fachgebiet Makromolekulare Chemie, Fachbereich C - Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42119 Wuppertal, Germany

Charge transfer complexes formed by mixing the molecular acceptor tetrafluoro-tetracyanoquinodimethane (F4TCNQ) with different donor materials (based on oligothiophene/quinoxaline copolymers) in thin films were investigated. Infrared absorption spectroscopy was used to quantify the donor-acceptor charge transfer as function of acceptor concentration. Furthermore, current/voltage curves of such thin films were measured, and a pronounced increase of the conductivity was found for increasing acceptor concentration (up to three orders of magnitude). However, the dependence of the conductivity on acceptor concentration was sub-linear, implying that the charge carrier mobility was reduced upon charge transfer complex formation.