Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 18: Molecular Electronics and Photonics
CPP 18.12: Vortrag
Dienstag, 8. März 2016, 12:30–12:45, H42
Direct probe of injection efficiency in asymmetric coplanar organic transistors — •Karin Zojer1, Thomas Rothländer2, Herbert Gold2, Anja Haase2, and Barbara Stadlober2 — 1Institute of Solid State Physics and NAWI Graz, Graz University of Technology, Graz, Austria — 2MATERIALS Institute for Surface Technologies and Photonics, JOANNEUM RESEARCH Forschungsgesellschaft mbH, 8160 Weiz, Austria
Injection of carriers from the metal contacts into organic semiconductors crucially determines the performance of organic electronic devices, as mobile charges must essentially be provided by the contact. Asymmetric coplanar transistors with overlaps or single-sided small gaps between source/drain and gate electrode allow us to locally modify the electric field solely near the injecting contact. Utilizing self-aligned nanoimprint lithography interlayer electrode offsets between -0.2-1.7 µm were realized. Given that injection typically occurs via Schottky-type barriers, the comparison of the operation of the same device with either source-sided gap or drain-sided gap directly probes the impact of the electric field on the injection efficiency without changing biases and injection barriers. We explain that transistors with a gap between source and gate electrode operate and that the profound reduction in current can be attributed to inhibited injection.