Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
The potential of organic photovoltaics (OPVs) in large-area, indoor and semi-transparent applications has been rapidly growing. So far, the efficiency of OPV has seen a significant boost of over 19% due to the progress in non-fullerene acceptors (NFAs) and conjugated polymer donors. Nevertheless, the limitations of synthetic complexities, high processing cost, and their long-term stability have served as a deterrent to the development of OPV commercialisation, due to the lack of complete understanding in material photophysics and design rules.
In this study, we plan to study the potential of FO6-T in large-scale and semi-transparent applications via multiple spectroscopy techniques. FO6-T is a new low-cost donor polymer, which requires only two synthesis steps. When blended it with NFA L8BO, devices achieved over 15% efficiency.
We observed the red-shift absorption spectrum in FO6-T compared with current donor materials, indicating its great potential in semi-transparent devices. Femtosecond transient absorption spectroscopy (TAS) was employed and we observed the charge generation and charge transfer states in both neat and blended FO6-T systems. We investigated long-lived charge carriers in neat FO6-T films in both femtosecond and micro-second TAS, which suggests a possible free charge generation process. Furthermore, we studied the role of long-lived charge carriers in FO6-T:L8BO organic solar cells by photoluminescence and fluence-dependent TAS techniques.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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