We demonstrate the relationship between
the topology (the way in
which the atoms are connected), open-shell character, and singlet
fission (SF) propensity in a series of diboron-doped anthracenes and
phenanthrenes. The study is performed by using high-level wave-function-based
quantum-chemical calculations. The results show that the molecular
topology plays a crucial role for the optical properties and, respectively,
for the SF propensity of the studied compounds. The topology-derived
correlations between the structure and properties are interpreted
in the light of the Kekulé hydrocarbons concept and serve as
molecular design guidelines for the discovery of new SF materials.
Finally, several boron-doped polycyclic aromatic hydrocarbons are
proposed as SF chromophores for organic solar cells.
Singlet fission, a multiple exciton generation process, can revolutionize existing solar cell technologies. Offering the possibility to double photocurrent, the process has become a focal point for physicists, chemists, software developers, and engineers. The following review is dedicated to the female investigators, predominantly theorists, who have contributed to the field of singlet fission. We highlight their most significant advances in the subject, from deciphering the mechanism of the process to designing coveted singlet fission materials.
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