Berlin 2008 – scientific programme

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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 4: Organic Devices II

SYSA 4.2: Talk

Tuesday, February 26, 2008, 17:00–17:15, H 2013

How to adjust or avoid hysteresis in poly(vinyl alcohol) based organic field effect transistors — •Martin Egginger¹, Mihai Irimia-Vladu², Reinhard Schwödiauer², Andreas Tanda³, Siegfried Bauer², and Serdar Sariciftci¹ — ¹LIOS, JK University Linz, Altenbergerstr. 69, 4040 Linz, Austria — ²SOMAP, Soft Matter Physics, JK University Linz, Altenbergerstr. 69, 4040 Linz, Austria — ³plastic electronic, Rappetsederweg 28, 4040 Linz, Austria

Poly(vinyl alcohol) (PVA) is an interesting water soluble gate insulator material in organic field effect transistors. Transistors with and without hysteresis in the transfer characteristic can be produced, depending on the process conditions of the PVA dielectric. Sodium acetate, an ionic salt that is needed in the production of PVA, is not completely removed during the industrial purification process. Such ionic impurities cause the hysteresis in PVA based organic field effect transistors [1]. While a hysteresis is desirable in memory elements it is unwanted in transistors for electronic circuits. Ways to prepare transistors with a desired transfer characteristic are described. Furthermore the influence of different ions on the size of the hysteresis is investigated. Finally we discuss that varying measurement conditions (temperature, sweep frequency and amplitude) also influence the size of the hysteresis.

[1] Martin Egginger, Mihai Irimia-Vladu, Reinhard Schwödiauer, Andreas Tanda, Irene Frischauf, Siegfried Bauer and Niyazi Serdar Sariciftci, Adv. Mat. 2007 (accepted), DOI: 10.1002/adma.200701479