Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.122
Publication date: 23rd September 2021
Non-fullerene acceptor-based ternary organic solar cells have demonstrated better photo charge generation than their binary counterparts.[1] But, underlying photophysics and the trade-off between complementary absorption and the energy offset between donor and acceptor(s) on the charge generation is not fully understood. This understanding is critical for material synthesis and device design.[2] In this work, we utilize ultrafast laser spectroscopy technique to study the charge generation in several NFA-based ternary blends with the polymer donor PM6. The selective excitation of PM6 leads to ultrafast singlet exciton energy transfer to the NFAs, outcompeting electron transfer. Subsequently, singlet excitons in the NFA undergo hole transfer to the donor, resulting in free charge generation. This requires sufficient ionization energy offset between donor and acceptors to ensure efficient free charge generation. While broad absorption spectrum is important for photon collection, but having sufficient ionization energy offset is crucial for charge generation and hence the quantum efficiency in ternary organic solar cells.
This publication is based on work supported by the KAUST Office of Sponsored Research (OSR) under award numbers OSR-2019-CARF/CCF-3079, OSR-CRG2018-3746.
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