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CPP: Chemische Physik und Polymerphysik

CPP 23: POSTER Functional Organic Thin Films

CPP 23.16: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Organic Field-Effect Transistors Utilising Highly Soluble Oligothiophene Based Swivel Cruciform — •Achmad Zen¹, Patrick Pingel¹, Dieter Neher¹, Joerg Grenzer², Askin Bilge³, Tony Farrell³, Ullrich Scherf³, Ferdinand Grozema⁴, and Laurens Siebbeles⁴ — ¹Institute of Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany — ²Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 128, 01328 Dresden, Germany — ³Macromolecular Chemistry, University of Wuppertal, Gauss Str.20, 42097 Wuppertal, Germany — ⁴Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherland

Two types of highly soluble oligothiophene based swivel cruciforms are presented as semiconducting materials in OFETs. Transistors made from these oligomers exhibited mobilities of more than 0.01 cm2/Vs and current on/off ratio of >10^5. This is among the highest values reported to date for wet processed OFETs utilising oligothiophenes. In fact, the OFET-mobilities are comparable to values extracted from pulse-radiolysis time resolved microwave conductivity (PR-TRMC) experiments, indicating that carrier trapping is insignificant. In depth examination of the morphological, optical characteristics and thermal stability of the materials were carried to obtain information on the packing of the oligomers in the layer. Finally, the correlation between the transistor performance and the crystallinity of the layers is addressed.