Rubrene Deposition on Au

Apparently the presence of such twisted molecules on the substrate leads to a strongly delayed nucleation and is not compatible with the growth of crystalline rubrene organic thin films. In fact it has been shown by using X-ray diffraction that rather smooth but amorphous rubrene films are formed upon room temperature deposition onto Si02 [35]. These observations explain the lack of 

One approach to resolve the problems encountered during OMBD of this particular non-planar organic molecule is to use a capsulated (so called hot wall ) evaporator. In that case the enhanced mbrene vapour pressure above the substrate makes a deposition at elevated temperatures close to the sublimation temperature possible. Such a film growth under thermodynamie rather than kinetic control makes the growth of highly ordered films consisting of laminar mbrene crystallites possible [25]. 

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