SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Organic Electronics and Photovoltaics III (joint session CPP/HL)
HL 39.3: Talk
Thursday, March 30, 2023, 10:00–10:15, GÖR 226
Orientation and Order of Molecular Subunits and Excited State Dynamics in a P3HT Bottlebrush Copolymer — •Arthur Markus Anton1,2, Friedrich Kremer1, Jenny Clark2, and Frank Cichos1 — 1Leipzig University, Peter Debye Institute for Soft Matter Physics, Linnéstr. 5, 04103 Leipzig, Germany — 2The University of Sheffield, Department of Physics and Astronomy, Hounsfield Rd, Sheffield S37RH, United Kingdom
Orientation and order at different length scales are believed to play a crucial role for the performance of organic semiconductor devices. Taking advantage of the material properties of bottlebrush copolymers and gain control of structure formation, a poly-(3-hexylthiophene) grafted copolymer has been studied [1]. In order to investigate the structure on the molecular scale the technique of Infrared Transition Moment Orientational Analysis (IR-TMOA) has been employed [2,3]. The absorbance of structure-related bands is evaluated depending on the inclination of the sample film (ϑ) and polarization of the IR light (ϕ). This combination then allows to determine the tensor of absorption separately for the respective molecular moieties and to deduce their orientation (Θ,Φ) relative to a sample-fixed coordinate system. In addition transient absorption measurements have been conducted. The dynamics of exciton and polaron formation and decay has been investigated and the derived results on the basis of the bottlebrush copolymer are compared with results from linear P3HT. [1] Heinrich and Thelakkat, J. Mater. Chem. C 4 (2016) 5370 [2] Anton et al, J. Am. Chem .Soc. 137 (2015), 6434 [3] Anton et al, Macromolecules 49 (2016) 1798