Parts | Days | Selection | Search | Updates | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VII

CPP 53.6: Talk

Friday, March 13, 2026, 11:00–11:15, ZEU/LICH

Tracking the degradation of non-fullerene organic solar cells in fluctuating environments — •Lixing Li, Thomas Baier, Xiaojing Ci, Zhaonan Jin, and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

The long-term operational stability of non-fullerene organic solar cells (OSCs) remains a critical challenge that limits practical applications. While substantial efforts have been devoted to understanding the degradation mechanisms of OSCs under extreme conditions such as high or low temperatures, far less attention has been paid to their potential recovery behaviour. In real-world environments, organic solar cells are not exposed to constant stress; instead, environmental factors such as temperature, humidity, and illumination fluctuate continuously over time. These dynamic variations may induce partial or even reversible changes in device performance and morphology. It is essential to explore not only how OSCs degrade under stress but also how they recover once the stress is relieved or altered. In this study, we investigate the recovery processes of BTP-4F non-fullerene organic solar cells subjected to multiple environmental parameters. Advanced characterisation techniques, including grazing-incidence X-ray scattering (GIXS) and atomic force microscopy (AFM), are employed to track both in-situ and ex-situ structural evolution within the active layer. These analyses provide new insights into the mechanisms governing the recovery and structural reorganisation of OSCs under dynamic environmental conditions.

Keywords: Organic solar cells; GIWAXS; GISAXS