19 September 2017 Truxenones on coinage metal surfaces: structure and epitaxial templating (Conference Presentation)
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Abstract
The interface between organic molecules and metallic surfaces is integral to the performance of organic optoelectronic devices. Considerable efforts have been focused on the synthesis and processing of novel donor and acceptor materials for high performance devices. Despite this, there is little understanding of the fundamental behaviour of these molecules at relevant metallic surfaces. The truxenone family of small molecule semiconductors exhibit three-fold symmetry, have stabilised lowest unoccupied molecular orbital (LUMO) energy levels, independently conjugated branches from the core and have been shown to exhibit promising properties as electron acceptors in organic solar cells. Our recent work has demonstrated that Truxenones self-assemble to form epitaxial open-pored structures on Cu (111), a highly unusual observation in semiconducting organic molecules. This assembly is affected by the choice of metal substrate and data from analogous Ag (111) and Au (111) interfaces will be compared and contrasted. In addition the use of a commensurate epitaxial truxenone template to direct the growth of commensurate epitaxial C60 layers will be shown. This strategy imparts the structural symmetry and in-plane structural order of the substrate into the molecular template and subsequent C60 layers and has implications for the growth of single-crystalline organic interfaces and devices.
Conference Presentation
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Luke A. Rochford, Luke A. Rochford, Alexandra J. Ramadan, Alexandra J. Ramadan, Christian Nielsen, Christian Nielsen, } "Truxenones on coinage metal surfaces: structure and epitaxial templating (Conference Presentation)", Proc. SPIE 10365, Organic Field-Effect Transistors XVI, 103650N (19 September 2017); doi: 10.1117/12.2273913; https://doi.org/10.1117/12.2273913
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