Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 15: [HL] Organic Semiconductors: Transistors and OLEDs (Joint Session DS/CPP/HL/O)
DS 15.7: Talk
Tuesday, March 23, 2010, 11:00–11:15, H15
Semiconducting Thin Films of Fluorinated and Unsubstituted Phthalocyanines for Applications in Organic Field Effect Transistors — •Harry Brinkmann1, Christopher Keil1, Olga Tsaryova2, Dieter Wöhrle2, and Derck Schlettwein1 — 1Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de — 2Institute of Organic and Macromolecular Chemistry, University of Bremen, Germany.
Perfluorinated phthalocyanines (F16Pc) show n-type characteristics as active layers in organic field transistors while organic field transistors with unsubstituted phthalocyanines (Pc) exhibit p-type characteristics. The growth of F16Pc and Pc films has been studied in OFETs on organic (polyimide, PMMA) and inorganic insulating layers (SiO2) with different surface modifications (HMDS treatments). We report here about the dependence of the growth mode of the films and the field effect mobility on the used substrate for the copper complexes. The development of the electrical conduction was studied in-situ during film growth and the field effect mobility was determined for various film thicknesses in different regimes of the Stranski-Krastanov growth mechanism that led to the formation of ultrathin conductive layers in the monolayer range followed by reorganization towards island growth. Optical absorbance was measured in reflection or transmission in dependence of the used substrate to investigate details of the intermolecular coupling.