Regensburg 2025 – scientific programme
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DS: Fachverband Dünne Schichten
DS 15: Organic Thin Films, Organic-Inorganic Interfaces
DS 15.5: Talk
Friday, March 21, 2025, 11:00–11:15, H3
Thermally Tuning the Optical Properties of Discrete NDI-T2 Oligomer Thin Films — •Alexander Ehm1, Fabian Eller2, Meike Kuhn2, Rukiya Matsidik1, Michael Sommer1, Eva M. Herzig2, and Dietrich R. T. Zahn1 — 1Faculty of Natural Sciences, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Dynamik und Strukturbildung - Herzig Group, Universität Bayreuth, Universitätsstr. 30, D-95447 Bayreuth, Germany
In the pursuit of developing and optimizing n-type organic semiconductors for the use in organic electronics, materials derived from naphthalene diimide (NDI) and bithiophene (T2), such as P(NDI2OD-T2), are highly interesting [1]. Changing the average molecular orientation via thermal annealing, and thereby their opto-electronic properties, allows finetuning for specific applications [2].
Recently, we showed that the optical anisotropy of the discrete oligomers NDI-(T2-NDI)2 and T2-(NDI-T2)2 can be influenced by thermal annealing [3]. Here, we extend this study and reveal that the photoluminescence and optical anisotropy, as found by variable-angle spectroscopic ellipsometry of T2-(NDI-T2)2 can be continuously tuned by the choice of the annealing temperature. The correlation with molecular alignment is investigated using grazing-incidence wide-angle X-ray scattering.
[1] Chen et al. J. Am. Chem. Soc. 2009, 131, 8
[2] Vu et al. ACS Macro Lett. 2023, 12, 140
[3] Ehm et al. Phys. Status Solidi B Basic Res. 2024, 2400202
Keywords: Oligomers; Variable-Angle Spectroscopic Ellipsometry; GIWAXS; optical anisotropy; organic semiconductors