Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.610
Publication date: 16th December 2024
Organic solar cells (OSCs) have demonstrated significant improvements in power conversion efficiency, surpassing 20%, largely due to the development of non-fullerene acceptors (NFAs).[1] However, the limited operational device stability continues to present challenges for the organic photovoltaic community.[2,3,4,5] Here, we investigated the photodegradation of thin films of the donor PTQ10, the NFA Y6, and their blends under AM 1.5 illumination using a solar simulator in ambient conditions. We found that the pristine PTQ10 and Y6 exhibit relatively higher photochemical stability compared to the PTQ10:Y6 blend after 45 hours of degradation. When the blend PTQ10:Y6 is exposed to light through a 400 nm long-pass filter, the degradation rate significantly decreases, indicating the influence of UV light on the blends. To address this, we incorporated a third component, PC70BM into the active layer of the PTQ10:Y6 blend. The results show that the degradation rate in white light (AM 1.5) on the ternary blend (PTQ10:Y6:PC70BM) has the same rate as 400 nm long-pass filtered light on the binary blend (PTQ10:Y6), suggesting that the addition of PC70BM does not mitigate UV-induced degradation. These results are confirmed by UV-vis absorption spectra and IR spectra. The atomic force microscopy images show that after 45 hours of degradation, a slight increase in the roughness of the films is observed. The addition of a third component could be an effective way to improve the photostability of the active layer used in OSCs.
EM acknowledges the Swedish Energy Agency (contract 48598-1) for financial support of the project. The Knut and Alice Wallenberg Foundation (grant number 2016.0059) is acknowledged for the financial support for the research equipment used in the project.
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