Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.160
Publication date: 23rd September 2021
Reducing non-radiative recombination of charge transfer (CT) state - appearing at the donor-acceptor interfaces in organic solar cells - is essential to achieve high fill factor (FF) and open circuit voltage (VOC) in organic solar cells. Whereas the role of energetic disorder in such devices for charge generation is discussed extensively, the impact on non-radiative recombination is largely unexplored. The present study introduces a new understanding of organic solar cells with reduced non-radiative recombination losses. We show that combining high FF and VOC is possible when non-radiative recombination of the CT state is supressed by reducing the energetic disorder. These findings open the route for the next prospect in the design of materials. This prospect asserts that intrinsic limit for the VOC and FF of organic solar cells can be reduced compared with other photovoltaic technologies. This study provides a rationale to explain and further improve the VOC and FF of organic solar cells, which is an essential step towards their commercialisation.
Acknowledge the Alexander von Humboldt Foundation for funding.
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