The growth and investigations of single crystals of small molecule organic semiconductors is of crucial importance for the deeper understanding of these materials. We apply both a horizontal vapor-growth technique as well as growth from solutions to fabricate mm-sized single crystals of Phenanthrene, Pentacene, Rubrene and Dibenzopentacene. In this contribution, we present the optimized crystal growth parameters together with investigations of the structural properties.
Recently, it was found that in some of these materials superconductivity can emerge after intercalation with alkali-earth metals [1]. Therefore, these materials are promising with respect to their semiconducting as well as superconducting properties [2].
Here, we show the results of our preliminary intercalation experiments on single crystals to investigate the crossover from semi- to superconducting behaviour.
[1] M. Xue et al., Scientific Reports 2, 389 (2012)
[2] R. Mitsuhashi et al., Nature, 464, p.76-79 (2010).

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1. Synthesis and crystal growth of REFeAsO_1-xF_x (RE = La, Nd)
2. Ferromagnetic QCP in YbNi₄(P_1-xAs_x)₂