Polymorphism of dioctyl-terthiophene within thin films: The role of the first monolayer

C Lercher and C Rothel and OM Roscioni and YH Geerts and Q Shen and C Teichert and R Fischer and G Leising and M Sferrazza and G Gbabode and R Resel, CHEMICAL PHYSICS LETTERS, 630, 12-17 (2015).

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. (C) 2015 The Authors. Published by Elsevier B.V.

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