Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Organic photovoltaic development has progressed rapidly in recent years due to the emergence of non-fullerene acceptors (NFAs). These materials outperform their fullerene counterparts in strong and broad light absorption, narrow bandgap, good (photo) stability, high electron mobility, and efficient charge generation via the acceptor's exciton. Recently, there has been evidence that Y6 generates free charge carriers immediately after photoexcitation without needing a donor/acceptor interface. However, the mechanism of this intrinsic charge generation has yet to be fully understood. This work presents a comprehensive photo-physics study of Y6 excitons in a thin film, diluted solid state, and solution via transient absorption (TA) and time-resolved photoluminescence (TRPL) spectroscopies. The assignment of excited states’ spectral features observed in TA experiments was done with the help of reference spectra from chemical- and photo-induced absorption with photosensitizer at cryogenic and room temperatures. The excited states’ kinetics at these characteristic energies at different fluences were also explored. Under excitation with high-energy photons, we observed an electroabsorption signature due to the fast generation of long-lived radical holes at ~1.56eV in a few 100ps. In contrast, a broad charge peak at 1.9eV was also observed upon excitation at lower photon energy. In addition, the exciton diffusion length of 46nm was also determined through exciton-exciton annihilation via fluence-dependent TA measurements.
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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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