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Open AccessArticle

Organic Field-Effect Transistors Based on a Liquid-Crystalline Polymeric Semiconductor using SU-8 Gate Dielectrics onFlexible Substrates

1
Research Center for Microperipheric Technologies, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany
2
Fraunhofer Research Institution for Modular Solid State Technologies EMFT, Hansastr. 27d, 80686 Munich, Germany
3
Electronics Packaging Lab (IAVT), Technische Universität Dresden, Helmholtzstr. 10, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Materials 2014, 7(11), 7226-7242; https://doi.org/10.3390/ma7117226
Received: 11 August 2014 / Revised: 2 October 2014 / Accepted: 15 October 2014 / Published: 29 October 2014
(This article belongs to the Special Issue Organic Transistor)
In this work, the insulating properties of poly(4-vinylphenol) (PVP) and SU-8 (MicroChem, Westborough, MA, USA) dielectrics are analyzed and compared with each other. We further investigate the performance behavior of organic field-effect transistors based on a semiconducting liquid-crystal polymer (LCP) using both dielectric materials and evaluate the results regarding the processability. Due to the lower process temperature needed for the SU-8 deposition, the realization of organic transistors on flexible substrates is demonstrated showing comparable charge carrier mobilities to devices using PVP on glass. In addition, a µ-dispensing procedure of the LCP on SU-8 is presented, improving the switching behavior of the organic transistors, and the promising stability data of the SU-8/LCP stack are verified after storing the structures for 60 days in ambient air showing negligible irreversible degradation of the organic semiconductor. View Full-Text
Keywords: liquid-crystal polymers; organic field-effect transistors; organic semiconductor; long-term stability liquid-crystal polymers; organic field-effect transistors; organic semiconductor; long-term stability
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Tetzner, K.; Bose, I.R.; Bock, K. Organic Field-Effect Transistors Based on a Liquid-Crystalline Polymeric Semiconductor using SU-8 Gate Dielectrics onFlexible Substrates. Materials 2014, 7, 7226-7242.

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