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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Organic Electronics and Photovoltaics I
CPP 3.7: Talk
Monday, March 17, 2025, 11:00–11:15, H38
Thermal degradation behavior of BTP-4F-12 based green-solvent organic solar cells — •Zerui Li1, Jinsheng Zhang1, Simon Wegener1, Yingying Yan1, Xiongzhuo Jiang1, Kun Sun1, Matthias Schwartzkopf2, Sarathlal Koyiloth Vayalil2,3, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany — 3Applied Sciences Cluster, University of Petroleum and Energy Studies UPES, Dehradun, Uttarakhand, 248007, India
Thermal degradation is inevitable for organic solar cells in real application conditions. The common research of thermal stability could only observe ex-situ conditions before and after heating and the device behavior during heating is missing, which is insufficient to the understanding of degradation mechanisms. Herein, a new observation aspect is realized to analyze the thermal degradation of BTP-4F-12 based green-solvent organic solar cells with the application of operando GIWAXS/GISAXS, which provides a deep learning of thermal degradation. The OSC devices show a harsh Voc loss with temperature increase, which would recover mostly after getting cooled down to low temperature, while the loss of FF and Jsc during aging is irreversible. Thus, polymer donors play a crucial role in the device performance as well as thermal behavior. In addition, such thermal degradation is driven by the evolution of the molecular stacking and aggregation and thermal expansion/contraction during aging.
Keywords: non-fullerene organic solar cells; thermal stability; operando study; GIWAXS/GISAXS; polymer donor