Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems
HL 28.21: Poster
Montag, 11. März 2013, 16:00–20:00, Poster A
Effects of p-doping on charge carrier concentration and charge carrier transport in organic-inorganic composite thin layers — •Carsten Leinweber1,2, Diana Nanova1,2, Daniela Donhauser1,4, Eric Mankel2,3, Wolfgang Kowalsky1,2,4, Uli Lemmer5, and Norman Mechau2,5 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Germany — 2InnovationLab, Heidelberg, Germany — 3Institut für Materialwissenschaft, Technische Universität Darmstadt, Germany — 4Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Germany — 5Lichttechnisches Institut, Karlsruhe Institute of Technology, Germany
Understanding the influence of doping on conductivity, mobility and charge carrier concentration is one of the main challenges towards high-efficiency organic devices. It has been shown that p-type doping of 4,4*-Bis(N-carbazolyl)-1,1*-biphenyl (CBP) with transition metal oxides like MoO3 increases the bulk conductivity of the organic layer. However, a very low doping efficiency for various mixing ratios has been observed. Therefore, we investigated the electronic properties of thermally co-evaporated layers with different doping concentrations using charge extraction by linearly increasing voltage (CELIV). In the CELIV technique charge carriers are extracted by a linearly increasing voltage pulse in reverse bias over a non-injecting contact. From the resulting current transient charge mobilities and charge carrier densities were determined. Furthermore, we correlated our investigations to morphology studies on the dopant distribution to understand the fundamentals of the underlying doping mechanism and its low efficiency.