Charge-transfer excitons in strongly coupled organic semiconductors
AuthorGlowe, J. -F
Hayes, Sophia C.
SourcePhysical Review B - Condensed Matter and Materials Physics
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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 (CTXs5% yield), with radii spanning 2-3 sites. The significant charge-transfer exciton (CTX) yield results from the strong charge-transfer character of the Frenkel exciton band due to the large free-exciton bandwidth (∼400meV) in these supramolecular nanostructures. © 2010 The American Physical Society.