Lercher Christoph, Röthel Christian, Roscioni Otello Maria, Geerts Yves Henri, Shen Quan, Teichert Christian, Fischer Roland, Leising Günther, Sferrazza Michele, Gbabode Gabin, Resel Roland
Institut für Festkörperphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria.
ams AG, Tobelbader Strasse 30, 8141 Unterpremstätten, Austria.
Chem Phys Lett. 2015 Jun 16;630:12-17. doi: 10.1016/j.cplett.2015.04.027.
The origins of specific polymorphic phases within thin films are still not well understood. The polymorphism of the molecule dioctyl-terthiophene is investigated during the presence of a silicon-oxide surface during the crystallisation process. It is found that a monolayer of molecules forms two-dimensional crystals on the surface. In the case of thicker films crystalline islands are formed, a comparison of the three polymorphic phases observed within thin films and the thermodynamically more stable single crystal phases reveals distinct differences which can be related to an adaption of the molecular packing with the flat surface of the substrate.
薄膜中特定多晶型相的起源仍未得到很好的理解。在结晶过程中，研究了在二氧化硅表面存在的情况下分子二辛基 - 对三联苯的多晶型现象。发现单分子层在表面形成二维晶体。在较厚薄膜的情况下会形成晶体岛，对薄膜中观察到的三种多晶型相和热力学上更稳定的单晶相进行比较，发现存在明显差异，这可能与分子堆积适应衬底的平坦表面有关。
