Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors
HL 72.20: Poster
Mittwoch, 28. März 2012, 16:00–19:00, Poster D
Growth and characterization of sublimation grown 9,10-diphenylanthracene single crystals — •T. Schmeiler1, M. Zellmeier1, and J. Pflaum1,2 — 1Exp. Phys. VI, Julius-Maximilians-University Würzburg, D-97074 Würzburg — 2ZAE Bayern e.V. , D-97074 Würzburg
Organic single crystals define an important class of solid states due to their structural, chemical and functional homogeneity. In case of polyaromatics, single crystals provide reference systems with respect to optical properties, charge carrier transport and their respective spatial anisotropies. Here we present a study on 9,10-diphenylanthracene (DPA) single crystals grown via sublimation under streaming nitrogen gas. The lateral extension of the DPA crystal reveals (010) facet areas up to 0,5 cm2 at thicknesses of 100 µ m. The high structural quality is confirmed by X-ray diffraction as well as by the charge carrier transport measured by time-of-flight (TOF). To map existing dislocation lines, we developed an etching protocol which, as for the case of 5,6,11,12-tetraphenyltetracene (rubrene), yields to pyramidal-shaped etch pits at termination points of the [001] dislocation lines. Depending on etching conditions, like concentration and time, the sizes of the epitaxially oriented pits can be tuned in the range of several micrometres thereby promising interference with optical excitation wavelenght. In the case of rubrene, such structures were already investigated by means of Photoluminescence (PL) measurements in combination with FDTD simulations, both revealing enhanced PL-intensities at the pit edges due to waveguiding and enhanced light scattering.