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      Enabling singlet fission by controlling intramolecular charge transfer in π-stacked covalent terrylenediimide dimers

      , , , , , ,
      Nature Chemistry
      Springer Nature

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          Singlet fission.

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            Solar conversion efficiency of photovoltaic and photoelectrolysis cells with carrier multiplication absorbers

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              Mechanism for singlet fission in pentacene and tetracene: from single exciton to two triplets.

              Singlet fission (SF) could dramatically increase the efficiency of organic solar cells by producing two triplet excitons from each absorbed photon. While this process has been known for decades, most descriptions have assumed the necessity of a charge-transfer intermediate. This ab initio study characterizes the low-lying excited states in acene molecular crystals in order to describe how SF occurs in a realistic crystal environment. Intermolecular interactions are shown to localize the initially delocalized bright state onto a pair of monomers. From this localized state, nonadiabatic coupling mediated by intermolecular motion between the optically allowed exciton and a dark multi-exciton state facilitates SF without the need for a nearby low-lying charge-transfer intermediate. An estimate of the crossing rate shows that this direct quantum mechanical process occurs in well under 1 ps in pentacene. In tetracene, the dark multi-exciton state is uphill from the lowest singlet excited state, resulting in a dynamic interplay between SF and triplet-triplet annihilation.
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                Author and article information

                Journal
                Nature Chemistry
                Nature Chem
                Springer Nature
                1755-4330
                1755-4349
                August 15 2016
                August 15 2016
                : 8
                : 12
                : 1120-1125
                Article
                10.1038/nchem.2589
                27874873
                b036dc84-b9f6-4114-b396-fa68754a61a5
                © 2016
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