Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.37: Poster

Montag, 17. März 2025, 19:00–21:00, P4

Modulate Pre-aggregation to Optimize the Morphology in Organic Solar Cells — •Tim Bohnen, Jinsheng Zhang, and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

Morphology optimization has emerged as a key strategy to effectively improve device performance and stability in organic solar cells. Due to the solution-processing method, the selection of solvents for precursor solutions is crucial, as it directly affects the ultimate the morphology of active layer. Recent research demonstrates that donor and acceptor molecules form aggregates of varying sizes in precursor solutions, subsequently inducing different phase separation and crystallization behavior during drying process. However, the detailed correlation between pre-aggregation behavior and final morphology has yet to be fully elucidated. In this study, the active layer is composed of PBDB-TF-TTz acting as the donor and BTP-4F-24 as the non-fullerene acceptor. Next, we characterize the resulting morphology using atomic force microscopy (AFM) and grazing incidence small- and wide-angle X-ray scattering (GIWAXS and GISAXS).

Keywords: non-fullerene organic solar cells; morphology; AFM; GIWAXS/GISAXS; polymer donor