Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.083
Publication date: 11th July 2022
Organic solar cells (OSCs) have attracted great attention owing to their unique advantages such as lightweight, flexibility and solution processability for further commercial applications[1]. In recent years, the efficiency of OSC has grown rapidly with the help of burgeoning Y-series electron acceptors[2]. Benefits from structural modification, well-adjusted energy levels, absorption property, crystallinity and mobility have all attributed to the efficiency enhancement[2]. However, as another critical factor for commercialization, stability, especially photostability change generated from such structural modification remains elusive. To unveil the relationship, four Y-series acceptors with different terminal groups, internal and outer alkyl chains were selected to compare the photo-induced degradation from both device and structural perspectives. Significant increased trap-assisted recombination was observed after continuous illumination, which could be related to the structure change of the acceptors exhibited in NMR and Raman spectra. The energy barriers of happening the light-triggered reactions on acceptors are further evaluated through density functional theory (DFT) calculation. As a result, acceptors with fluorinated terminal groups and long internal alkyl chains will enhance the photostability of devices. This trend is further shown on additional two Y-series acceptors based devices. Finally, encapsulated devices with Y-series acceptors are tested under real-world conditions, showing a similar conclusion as photostability results. Our results provide an in-depth understanding of the light-soaking and outdoor stability of Y-series acceptors, and important guidelines for the designation acceptor materials to achieve stable OSCs.
The authors acknowledge support by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: CCF-3079.
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