Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Non-fullerene acceptors have enabled significant advances in organic solar cells. This makes it important to understand more about their charge transport properties. Here, we looked at two acceptors, ITIC and IDTBR, and analysed their electron mobility using a time of flight method. Using this method allows for the measurement of either the electron or hole mobility independently, and gives insight into in-film charge dynamics that stem from trapping or disorder. When blended with the common polymer donor P3HT, ITIC has a zero-field electron mobility of 1.0 x 10-4 cm2/Vs, while IDTBR has a mobility of 5.6 x 10-5 cm2/Vs. Although these electron mobility values are slower than that of PC71BM, this magnitude of electron mobility matches more closely with the hole mobility of the blends. Our results suggest that better charge mobility balance is a factor that contributes to the excellent performance of non-fullerene acceptor solar cells.
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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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