Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.080
Publication date: 30th March 2023
Organic donor:acceptor solar cells have been reestablished as a serious contender among alternative photovoltaic technologies thanks to the emergence of fullerene-free bulk heterojunctions. Record efficiencies have been reported for combinations of polymer donors and small molecule acceptors, which show both a high fill-factor and photocurrent and comparably small voltage losses. In the past, much effort has been made to reveal the role of the interfacial charge transfer states in typical polymer:fullerene blends in order to reduce energetic losses while maintaing high initial exciton separation yields; with non-fullerene acceptors, however, the efficiency gain might at least in part be driven by an effective intra-phase charge separation. At the same time, incorporation of a donor remains necessary to reach good photovoltaic efficiencies.
Under on these circumstances, we need to rethink the role of the donor:acceptor interface, including charge transfer state energetics, and its contribution to charge separation and recombination. At the same time, we are intrigued to have a closer look into photophysics which were deemed less significant with fulleren acceptors to continue increasing the photogeneration yield. Therefore, we have focused on the contributions from several spectral regimes, both below and above the absorption edge, to the photocurrent of organic solar cells in the steady-state and close to working conditions via applied electrical and light biases. By using ultra-sensitive electro-optical quantum efficiency spectroscopy, we are able to resolve their respective field dependency of the photogeneration yield. Our results show that the internal quantum efficiency includes distinct spectral variations in highly effective donor:acceptor blends, indicating that the charge separation efficiency can be optimized even further.
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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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