Abstract
Fast and highly efficient intramolecular singlet exciton fission in a pentacene dimer, consisting of two covalently attached, nearly orthogonal pentacene units is reported. Fission to triplet excitons from this ground state geometry occurs within 1 ps in isolated molecules in solution and dispersed solid matrices. The process exhibits a sensitivity to environmental polarity and competes with geometric relaxation in the singlet state, while subsequent triplet decay is strongly dependent on conformational freedom. The near orthogonal arrangement of the pentacene units is unlike any structure currently proposed for efficient singlet exciton fission and may lead to new molecular design rules.
Highlights
Introduction rate ofsinglet exciton fission (SEF) is greatly affected by the strength of intermolecular coupling within the film.[4]
The maximum efficiency of solar cells is limited by the ther- pentacene, triplet pair formation is exothermic and the intermalization of high-energy excitons generated through the molecular coupling is strong, resulting in SEF with an 80 fs absorption of photons well above the band gap.[1]
Which consists of the separation of a singlet exciton into two it was recently demonstrated in concentrated solutions of TIPS-pentacene that singlet fission can proceed at high effi
Summary
SEF is greatly affected by the strength of intermolecular coupling within the film.[4] In the canonical system, The maximum efficiency of solar cells is limited by the ther- pentacene, triplet pair formation is exothermic and the intermalization of high-energy excitons generated through the molecular coupling is strong, resulting in SEF with an 80 fs absorption of photons well above the band gap.[1] One way time constant and nearly 200% yield.[5]. Crystalline, polycrystalline or amorphous solids, the most this process is accomplished by singlet exciton fission (SEF), basic unit capable of SEF is a pair of chromophores. Which consists of the separation of a singlet exciton into two it was recently demonstrated in concentrated solutions of TIPS-pentacene that singlet fission can proceed at high effi-.
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