Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Development and utilization of non-fullerene acceptors (NFAs) in organic photovoltaics have boosted the device efficiency to ~20%, much higher than those based on fullerene acceptors. Among various high-performance NFA families, Y-series NFA is one of the most intriguing categories. the curved A-DA'D-A molecular structure enables strong intermolecular interactions between Y-molecules that could form intermolecular charge-transfer (CT) states. Several models have been proposed to understand the charge transfer mechanisms in the efficient donor/Y-series NFA systems. However, the photophysics within neat Y-series NFA films is still in contradictory in literatures, resulting in an unclear picture of the charge carrier dynamics in Y-series NFAs.
Here, we combined four different steady-state and time-resolved spectroscopies to study Y-series materials with controlled intermolecular interactions to work out a unified model of photophysics in Y-series NFA. First, our experiments confirmed existence of multiple states, especially sub-gap CT state, in neat Y-series films. Second, we confirmed the CT state locates ~20 meV lower than the singlet state. Due to the very small energy difference, we observed that the singlet state and CT state are in thermal equilibrium which dominates the kinetics of the two states as a function of temperature.
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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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