Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 6: Organic electronics and photovoltaics (DS with HL/CPP)
HL 6.4: Vortrag
Montag, 16. März 2015, 10:15–10:30, H 2032
Organic ambipolar field-effect transistors: In situ electrical investigation of MnPC-OFETs — •Franziska Lüttich, Ovidiu D. Gordan, and Dietrich R. T. Zahn — Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, Germany
On the way to low-cost and flexible applications organic semiconducting materials are promising. Devices like organic light-emitting diodes, organic solar cells, and organic field-effect transistors (OFETs) can be produced e.g. on flexible and elastic substrates and with chemical variation of side groups or substitution of metal centers their properties like optical absorption and charge carrier mobilities can be influenced.
Here we present a temperature dependent study on Manganese Phthalocyanine (MnPc)-OFETs, which reveal an ambipolar behaviour. In order to investigate the electrical properties of MnPc we used OFET "‘end-of-line"’ substrates from Fraunhofer IPMS with a 100 nm thick thermal silicon dioxide layer as dielectric. The investigated bottom-contact OFETs were fabricated under high vacuum conditions (p < 4 · 10−7 mbar) by evaporating MnPc on top of the pre-structured substrates. The electrical DC characteristics were measured in situ as a function of temperature. This procedure enables us to determine the activation energies for the hole and electron transport. The influence of ambient atmosphere was also investigated and revealed strong impact on the electrical performance. The topography was determined using an Atomic Force Microscope (AFM).