Singlet exciton fission via an intermolecular charge transfer state in coevaporated pentacene-perfluoropentacene thin films | Zendy

Vincent Kim | Zendy; Katharina Broch | Zendy; Valentina Belova | Zendy; Y. S. Chen | Zendy; Alexander Gerlach | Zendy; Frank Schreiber | Zendy; Hiroyuki Tamura | Zendy; Raffaele Guido Della Valle | Zendy; Gabriele D’Avino | Zendy; Ingo Salzmann | Zendy; David Beljonne | Zendy; Akshay Rao | Zendy; Richard H. Friend | Zendy

Open Access

Singlet exciton fission via an intermolecular charge transfer state in coevaporated pentacene-perfluoropentacene thin films

Author(s) -

Vincent Kim,

Katharina Broch,

Valentina Belova,

Y. S. Chen,

Alexander Gerlach,

Frank Schreiber,

Hiroyuki Tamura,

Raffaele Guido Della Valle,

Gabriele D’Avino,

Ingo Salzmann,

David Beljonne,

Akshay Rao,

Richard H. Friend

Publication year - 2019

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.5130400

Subject(s) - singlet fission , pentacene , exciton , intermolecular force , singlet state , organic semiconductor , fission , ultrafast laser spectroscopy , biexciton , excitation , intramolecular force , materials science , spectroscopy , chemical physics , semiconductor , atomic physics , molecular physics , chemistry , condensed matter physics , excited state , physics , optoelectronics , nanotechnology , molecule , nuclear physics , quantum mechanics , stereochemistry , layer (electronics) , organic chemistry , neutron , thin film transistor

Singlet exciton fission is a spin-allowed process in organic semiconductors by which one absorbed photon generates two triplet excitons. Theory predicts that singlet fission is mediated by intermolecular charge-transfer states in solid-state materials with appropriate singlet-triplet energy spacing, but direct evidence for the involvement of such states in the process has not been provided yet. Here, we report on the observation of subpicosecond singlet fission in mixed films of pentacene and perfluoropentacene. By combining transient spectroscopy measurements to nonadiabatic quantum-dynamics simulations, we show that direct excitation in the charge-transfer absorption band of the mixed films leads to the formation of triplet excitons, unambiguously proving that they act as intermediate states in the fission process.

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