Regensburg 2016 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster III

HL 90.27: Poster

Thursday, March 10, 2016, 16:00–19:00, Poster A

The Influence of Morphology and Interface Treatment on Organic 6,13 bis(triisopropylsilylethynyl)-Pentacene Field-Effect Transistors — •Daniel Bülz, Franziska Lüttich, Sreetama Banerjee, Georgeta Salvan, and Dietrich R. T. Zahn — Semiconductor Physics, Technische Universität Chemnitz, Germany

For the development of electronics, organic semiconductors are of great interest due to their adjustable optical and electrical properties. Aiming for simpler fabrication processes, we investigate TIPS-pentacene organic field effect transistors (OFETs) made from solution with different techniques. Because of the different deposition methods, the TIPS-pentacene thin films exhibit different morphologies in terms of crystal size and homogeneity of the substrate coverage. Additionally, the interface treatment is known to have a strong influence on the threshold voltage, eliminating trap states of silicon oxide at the gate electrode and thereby changing the electrical switching response of the transistors. We therefore investigate the influence of interface treatment using either octadecyltrichlorosilane (OTS) or a simple cleaning procedure with acetone, ethanol, and deionized water. The transistors consist of prestructured OFET substrates including gate, source, and drain electrodes, on top of which TIPS-pentacene dissolved in a mixture of tetralin and toluene is deposited by spray-, or spin-coating. The OFETs are characterized by means of optical microscopy (in order to determine the overall quality of the sample, i.e. crystal size and coverage of the channel region) and electrical transport measurements.