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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.29: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Density of States at the Interface of Organic Permeable-Base Transistors — •Henning Iseke, Felix Dollinger, Hans Kleemann, and Karl Leo — Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Dresden, Germany

Organic permeable-base transistors (OPBT) are among the best performing organic transistors reaching on/off ratios of >108 and transition frequencies of >40 MHz. These vertical transistors resemble solid-state triodes where the current is controlled by the potential of a permeable electrode denoted as base. As for other organic transistors, the knowledge of the interfacial density of states is a key in order to develop an in-depth understanding of the device operation as well as degradation processes. However, for OPBTs, this interfacial density of states has not been revealed so far.

D. V. Lang et. al proposed a method to determine the density of states in organic field effect transistors by means of temperature dependent transfer characteristics. Here, we validate this method and discuss under which conditions it is applicable to OPBTs. Furthermore, we carry out systematic device investigations under various stress conditions, and discuss how this stress affects the interfacial density of states. This study helps to develop a deeper understanding of the underlying mechanisms of degradation in OPBTs. Moreover, it enables more systematic approaches for device optimization due to the knowledge of the interfacial density of states.

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