Charge-transfer excitons in strongly coupled organic semiconductors

Details Charge-transfer excitons in strongly coupled organic semiconductors Charge-transfer excitons in strongly coupled organic semiconductors

2009-10-14

arxiv.org/abs/0910.2515v2

Phys. Rev. B 2010 vol. 81 (4) pp. 041201

Physics

Condensed Matter

Materials Science

Physical Review B Rapid Communications (In Press)

Scientific paper

10.1103/PhysRevB.81.041201

Time-resolved and temperature-dependent photoluminescence measurements on one-dimensional sexithiophene lattices reveal intrinsic branching of photoexcitations to two distinct species: self-trapped excitons and dark charge-transfer excitons (CTX; > 5% yield), with radii spanning 2-3 sites. The significant CTX yield results from the strong charge-transfer character of the Frenkel exciton band due to the large free exciton bandwidth (~400 meV) in these supramolecular nanostructures.

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