Regensburg 2025 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.5: Poster
Donnerstag, 20. März 2025, 09:30–12:00, P3
Advanced Synchrotron Characterization of NDI based acceptor thin films — •Subhalakshmi Suresh Kumar1,2, Eva M. Herzig1, and Christopher R. McNeill2 — 1Dynamik und Strukturbildung - Herzig Group, Universität Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany — 2McNeill Research Group, Department of Materials Science and Engineering, Monash University, Wellington Road, Clayton, Victoria, 3800 Australia
The transition to renewable energy has brought polymer solar cells (PSCs) to the forefront due to their lightweight, flexible, and environmentally friendly properties. The alignment of conjugated polymers within PSCs is critical for improving charge transport and overall device performance. This study aims to enhance the alignment of NDI-based acceptor thin films by employing fabrication methods such as blade coating and post-treatment annealing. Thin films were methodically prepared by varying coating speeds, substrate temperatures, and annealing conditions, followed by characterization using UV-Vis spectroscopy, Near-Edge X-ray Absorption Fine Structure (NEXAFS), and Grazing Incidence Wide-Angle X-ray Scattering (GIWAXS). The analyses demonstrated a significant enhancement in molecular alignment after annealing, particularly in PNDITBT films, which showed pronounced backbone alignment. These findings highlight the potential of synchrotron-based techniques in optimizing thin-film microstructures, paving the way for the production of highly efficient laminated organic solar cells with bilayer heterojunctions.
Keywords: Molecular Alignment; NDI based acceptors; Synchrotron; Blade Coating; Annealing