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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.26: Poster
Wednesday, March 20, 2024, 11:30–13:30, Poster C
Aligning molecular backbones in thin films of organic semiconductors by meniscus guided coating methods — •Robin M. Teichgreber1, Christopher R. McNeill2, and Eva M. Herzig1 — 1Dynamik und Strukturbildung - Herzig Group, Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany — 2Material Science and Engineering, Monash University, 20 Research Way, Clayton, Australia
The performance of organic solar cells depends crucially on the ability of the generated excitons to diffuse to the donor/acceptor interfaces and to be dissociated there [1]. The exciton transport in the material depends strongly on the morphology of the film, including the orientation of the molecules. The orientation of the molecules is particularly important in highly anisotropic materials. While in previous studies [2][3] the focus was placed primarily on the orientation of the molecules relative to the substrate ("face-on" or "edge-on"), less attention was paid to the role of the orientation of the long axis of the molecules. Investigating the influence of molecular orientation on exciton transport requires samples that exhibit a high degree of alignment. We systematically study such samples using meniscus guided blade coating to gain a fundamental understanding of the physical processes that lead to the alignment of the molecular backbones. We employ methods based on optical spectroscopy and X-ray scattering to characterize the films. [1] Blom, P. W. M. et al. (2007). Advanced Materials. 19, 1551-1566 [2] Rand, B. P. et al. (2012). Advanced Functional Materials. 22, 2987-2995 [3] Ran, N. A. et al. (2017). Nature Communication. 8, 79
Keywords: Semiconducting Polymers; Molecular Orientation; GIWAXS; Blade Coating