Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.39: Poster

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

Tracking degradation of non-fullerene organic solar cells under dynamic environmental conditions — •Lixing Li, Lukas Spanier, Zhaonan Jin, Linus Huber, Guangjiu Pan, and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

The power conversion efficiency (PCE) of non-fullerene organic solar cells (OSCs) has already approached 20%, but stability and environmental degradation issues have always been one of the biggest challenges limiting their application. Considerable research has been conducted to understand the degradation mechanisms in OSCs, especially under extreme environmental conditions like high and low temperatures. While these studies offer valuable insights, they do not fully represent the dynamic conditions that most organic solar cells face in real-world environments. In practical scenarios, environmental factors such as temperature, humidity, and light fluctuate over time rather than remaining constant. Therefore, it is crucial to investigate how OSCs degrade not only under steady stress but also when exposed to varying environmental conditions. This study explores the degradation of BTP-4F non-fullerene organic solar cells subjected to multiple environmental cycles. Advanced characterization methods, including grazing-incidence X-ray scattering (GIXS) and atomic force microscopy (AFM), are used to monitor both in-situ and ex-situ structural changes in the active layer of OSCs, offering deeper insights into the underlying degradation mechanisms.

Keywords: Organic solar cells; Degradation; GISAXS