Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.40: Poster

Monday, March 17, 2025, 19:00–21:00, P4

Revealing the Effect of Solvent Vapor Annealing on the Morphology of Non-Fullerene Organic Solar Cells — •Liansong Chu — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

Solvent vapor annealing (SVA), as an effective post-treatment technique, has been widely used to optimize the morphology in organic solar cells (OSCs). When exposed to the specific solvent atmosphere, the swelling effect induced by solvent vapor facilitates molecular mobility of both donor and acceptor molecules, leading to modifications in crystallinity and phase separation. Hence, the selection of solvent and annealing duration for SVA is critical for the morphology, which ultimately determines the power conversion efficiency and stability. However, fundamental understanding of solvent selection criteria and the associated kinetic processes during treatment remains unknown. In this work, we systemically investigates the impact of different solvents for SVA on the morphological properties of non-fullerene OSCs (PBDB-TF-TTz as the donor and BTP-4F-24 as the acceptor) using atomic force microscopy (AFM), grazing incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS). Furthermore, we provide real-time insights into the morphological evolution during SVA through in situ UV-Vis absorption spectroscopy and photoluminescence measurements.

Keywords: solvent vapor annealing; organic solar cell; morphology; non-fullerene; in situ