Berlin 2008 – scientific programme
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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications
SYSA 5: Poster Session SYSA
SYSA 5.12: Poster
Tuesday, February 26, 2008, 14:30–20:00, Poster A
Transport properties and morphology of solution processed pentacene transistors — •Markus Kasper, Claudia Bock, and Ulrich Kunze — Werkstoffe und Nanoelektronik, Ruhr Universität Bochum, D-44780 Bochum, Germany
Recent developments have shown that precursors enabling solution deposition of pentacene thin films begin to rival vacuum deposited pentacene for organic field-effect transistor (OFET) applications. In this contribution 13,6-N-Sulfinylacetamidopentacene (NSFAAP) is used to fabricate and characterise bottom-contact OFETs with SiO2 dielectric. We study the influence of source and drain contact metals and the effect of a supplemental HMDS pretreatment of the gate oxide on the transport properties and the pentacene film morphology. In order to separate the sheet resistance from the parasitic series resistance of the contacts and leads different transistors with a channel length between L = 3 and 100 µ m are prepared. All transistors have a constant channel width of W = 2 mm. The pentacene thin films are deposited by spin coating NSFAAP from a CHCl3 solution in air and thermally converting the precursor to pentacene in a nitrogen environment. In order to achieve a homogenous film morphology and an improved coupling of the organic film to the electrodes the process parameters like spinning speed and conversion temperature are optimised.