Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster: Organic semiconductors and hybrid organic-inorganic heterostructures / Organic photovoltaics

HL 29.4: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Correlation between structural and electrical properties of co-evaporated doped organic thin films — •Daniela Donhauser1, 2, Anne K. Kast1, 2, 3, Martin Pfannmöller3, Rasmus R. Schröder3, Markus Gölz2, 4, Alexander Müller-Brand2, 4, Michael Kröger1, 2, Robert Lovrincic1, 2, and Wolfgang Kowalsky1, 21Institut für Hochfrequenztechnik, Technische Universität Braunschweig — 2InnovationLab GmbH, Heidelberg — 3CellNetworks, Universität Heidelberg — 4Kirchhoff-Institut für Physik, Universität Heidelberg

Nowadays, organic devices like OLEDs or OPV are often realized by employing electrochemically doped transport layers to enhance device performance and stability. However, a comprehensive and detailed understanding of the doping process in organic semiconductors is still missing. In this work the organic semiconductor CBP (4'-Bis(N-carbazolyl) -1,1'-biphenyl) doped with the transition metal oxide MoO3 was used as a model system and structural as well as electrical measurements were conducted to gain a better understanding of the fundamentals of electrochemical doping. Electron tomography revealed that the dopant forms a filamentous structure with nanofilaments preferentially orientated perpendicular to the substrate. To investigate whether the structural anisotropy influences the electrical properties, IV- and cryo-IV characteristics of device structures with current flowing along and perpendicular to the substrate were measured. Based on these results a model for charge transport in CBP:MoO3 composites will be presented.

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