Mobility of Non-fullerene Acceptors Using a Time of Flight Method
Natalie Mica a, Stuart Thomson a, Ifor Samuel a
a Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, St Andrews, Fife, KY16 9SS, UK
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Natalie Mica, 106
Publication date: 11th February 2019

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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