Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Morphology Prediction at Interfaces
O 12.5: Talk
Monday, March 7, 2016, 16:00–16:15, S051
Substrate-Induced Phases: Polymorphism of Organic Materials on Surfaces — •Andrew O. F. Jones1, Basab Chattopadhyay2, Yves H. Geerts2, and Roland Resel1 — 1Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria — 2Laboratoire de Chimie des Polymères, Faculté des Sciences, Université Libre de Bruxelles CP206/01, Campus de la Plaine, 1050 Brussels, Belgium
An increase or change of structural order in the vicinity of a solid substrate is known for a wide variety of materials. For molecular materials crystallizing on a solid surface, it has been observed that new polymorphic forms may exist near the interface with the substrate which have structures markedly different to those observed in the bulk material; such phases are termed Substrate-Induced Phases (SIPs). [1] The presence of a SIP in a compound or a class of materials can be of crucial significance in terms of its physical properties. However, the factors that drive such a process are not clearly understood or studied in depth. With the ultimate aim of controlling material properties by controlling structure, it is essential to take account of changes in the structure brought about by SIPs and to work towards controlling polymorphism in organic thin films. Several examples, with a particular focus on organic semiconducting materials, will be discussed to highlight the types of materials that can display SIPs and the current understanding of their origins.
[1] A. O. F. Jones, B. Chattopadhyay, Y. H. Geerts, R. Resel, Adv. Funct. Mater., 2015, Accepted for Publication.