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Abstract
Singlet fission has emerged as a promising strategy to avoid the loss of extra energy through thermalization in solar cells. A family of dimers consisting of nitrogen‐doped pyrene‐fused acenes that undergo singlet fission with triplet quantum yields as high as 125 % are presented. They provide new perspectives for nitrogenated polycyclic aromatic hydrocarbons and for the design of new materials for singlet fission.
Highlights
Singlet fission has emerged as a promising strategy to avoid the loss of extra energy through thermalization in solar cells
Singlet fission (SF) has emerged as a promising strategy to overcome the Shockley–Queisser limit that predicts a maximum power conversion efficiency of 33.7 % for a single junction device.[1]. This is because, in SF, a singlet excited state (S1) splits into two triplet excited states (T1) and the generation of the extra exciton per absorbed photon avoids the loss of extra energy through thermalization
SF has been observed in several families of conjugated molecules and polycyclic aromatic hydrocarbons,[2] among which the acene family have shown a prominent position
Summary
Singlet fission has emerged as a promising strategy to avoid the loss of extra energy through thermalization in solar cells. To shed light onto electronic interactions between the two dibenzoazahexacenes in the different dimers, we first turned to steady-state investigations in solvents with different polarity, namely toluene, THF, and benzonitrile (Figure 2 a; Supporting Information, Figure S1 and Table S1).
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