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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 1: Focus: Organic Solar Cells Based on Non-fullerene Acceptors: Loss Mechanism and Options for Above 20 % Efficiencies I

CPP 1.8: Vortrag

Montag, 27. März 2023, 12:00–12:15, GÖR 226

Thermal Degradation Mechanism in PM6: Y-series Acceptors Organic Solar Cells — •Si Chen, Julien Gorenflot, and Laquai Frederic — Abdullah University of Science and Technology Thuwal 23955-6900, Saudi Arabia

The stability issue is the core restriction for the application of organic solar cells (OSCs), and the study of the degradation mechanism of high-efficient PM6: Y-series systems is an urgent problem to be solved. We concluded one specific pathway of FF degradation for typical PM6:Y-series acceptors organic solar cells since FF changed most obviously after thermal aging. After developing several characterization measurements, including time-delayed collection field (TDCF), light intensity dependent measurements, etc. to study the photophysics of PM6:Y-series solar cells before and after thermal degradation, we can quantify FF degradation with field-dependent charge generation, non-geminate recombination, and transport resistance factors. The effect of transport resistance is quantified by the Suns-Voc method. The results show that the increase of charge transport resistance is the primary factor leading to FF degradation, which can be further explained by excessive phase separation with the information from GIWAXS and AFM. Our work can not only provide material design ideas for highly efficient and stable organic solar cells by figuring out the thermal degradation mechanism of PM6:Y-series organic solar cells but also come up with a new methodology to quantify the FF degradation of organic solar cells.