Berlin 2005 – scientific programme

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.35: Poster

Monday, March 7, 2005, 18:00–20:00, Poster TU A

Aqueous colloidal dispersions of ladder-type polymers as novel semiconducting materials for organic field effect transistor applications — •Dessislava Sainova, Silvia Janietz, Hartmut Krueger, and Armin Wedel — Fraunhofer Institute for Applied Polymer Research, Geiselbergstr. 69, 14476 Golm

The development of organic field effect transistors (OFETs) based on semiconducting polymers is an important and challening topic of the modern microelectronics which enables devices that combine the advantages of easy processing, low weight, mechanical flexibility and ability of properties-tuning by structural modifications. Most of the reported semiconducting polymers show p-type properties. Nevertheless both charge transport types are necessary for the realisation of numerous important logic elements. Recently an interesting solution to this task has been proposed in the form of a conjugated ladder-type poly(benzo-bisimidazobenzo-phenanthroline) (BBL) showing either ambipolar or n-type field effect properties dependent upon the sample preparation and processing. However this rigid-chain ladder polymer is not soluble in the common organic solvents resulting in a rather complicated technological transfer. We report the significant improvement of the BBL-processing utilizing aqueous colloidal dispersions and their OFET-application. The resultant devices demonstrate ambipolar electronic transport with charge carrier mobilities in the range of 10-5 cm2/Vs without specific optimization procedures.