Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.18: Poster

Monday, March 9, 2026, 19:00–21:00, P5

Bulk-Heterojunction Morphology Engineering in D18:Y6 Solar Cells — •Dennis Straub, Lixing Li, and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

Organic solar cells based on non-fullerene acceptors have attracted considerable interest due to their favourable optoelectronic properties and compatibility with low-temperature solution processing. In this work, the D18 polymer donor and the non-fullerene acceptor Y6 (BTP-4F) are used as the active layer materials. The study investigates how variations in fabrication parameters influence the evolution of the bulk-heterojunction morphology and the resulting photovoltaic behaviour. Key factors examined include solvent choice, wet-film formation, drying kinetics, and thermal treatment, which govern phase separation, domain purity, and molecular ordering within the active layer.

To further explore morphology control, selected additives are introduced that may affect miscibility, aggregation, and domain formation. Their influence on the structural organisation of the D18:Y6 blend is analysed to determine how additive-induced morphological changes impact charge generation, transport pathways, and recombination processes. By correlating structural characteristics with device performance, this work aims to clarify how processing and material modification shape the efficiency and reproducibility of D18:Y6 organic solar cells and to provide guidance for future optimisation.

Keywords: Organic solar cell; Additive engineering; Morphology evolution; Processing Parameters; Bulk-heterojunction