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Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Organic Electronics and Photovoltaics II (joint session DS/CPP/HL/O)

CPP 15.4: Talk

Tuesday, March 12, 2013, 10:15–10:30, H32

Correlation of morphology and electronic properties of MoO3 doped CBP layers I: TEM and electrical properties — •Daniela Donhauser1, 2, Levin Dieterle1, 2, Paul Heimel3, 2, Tobias Glaser3, 2, Maybritt Kühn4, 2, Mustapha Al-Helwi5, 2, Rasmus R. Schröder6, Eric Mankel4, 2, Michael Kröger1, 2, and Wolfgang Kowalsky1, 21Institut für Hochfrequenztechnik, TU Braunschweig, Braunschweig — 2InnovationLab GmbH, Heidelberg — 3Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg — 4Institut für Materialwissenschaft, TU Darmstadt, Darmstadt — 5BASF SE, Ludwigshafen — 6CellNetworks, Universität Heidelberg

Since electrochemical doping can significantly improve the performance of organic devices, the understanding of the fundamental properties of doped thin films is crucial. For a variety of different material systems a very low doping efficiency was observed, although from energetical considerations a very efficient charge transfer is expected. Using bright-field TEM and electron tomography we show for MoO3-doped CBP ((4,4’-Bis(N-carbazolyl)-1,1’-biphenyl) thin films that this low doping efficiency is due to filament-like dopant agglomeration which can be controlled by changing the substrate temperature during the evaporation process [1]. The observed morphology is finally correlated with electrical properties like charge carrier density and mobility and depending on the dopant concentration an anisotropic charge transport is observed.
Donhauser et al., Adv. Funct. Mater., 2012, 10.1002/adfm.201202089

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