Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.174
Publication date: 18th July 2019
Perylene diimides (PDIs) are exceptionally stable dyes that have several characteristics that make them attractive for application in organic photovoltaics. These include a strong absorption in the visible and excellent electron accepting properties. In addition, energetic characteristics of the lowest singlet and triplet level are close to ideal for singlet fission. A particular attractive aspect of PDIs is their synthetic versability. Introduction of sidechains allows a very wide tuning of the crystal packing and hence the electronic properties. In this contribution the effect of crystal packing in PDI materials on a variety of electronic propeeties will be discussed. This includes singlet fission, upconversion and triplet diffusion. The results show a strong correlation between crystal packing and singlet fission efficiency. The dynamics of singlet fission is studied by a combination of ultrafast spectroscopy and theoretical approaches. The subsequent triplet diffusion is studied by time-resolved microwave conductivity. The results show that PDIs have great promise for different processes in organic photovoltaics.
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