Institute of Solid State Physics
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SS22 WS22 SS23 WS23 SS24 WS24 Guidelines for Master Students
Polymorphism in Organic Thin Films 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). 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. Examples will be taken from literature and will be complemented by recent results from studies conducted at the TU Graz. |
