Phys. Rev. B 80, 045111 (2009) [8 pages]Photoinduced on-chain charge-separation and ultrafast recombination in a sugar-coated insulated molecular wireReceived 25 January 2009; revised 26 May 2009; published 15 July 2009 Transient absorption three-beam pump-push-probe experiments demonstrate that cyclodextrin-encapsulation of conjugated polymer chains prevents interchain effects, such as energy migration and charge hopping. In the unencapsulated polymer, transient population of high-lying singlet states leads to interchain ionization, generating long-lived charge-separated species. Supramolecular encapsulation prevents this process; with high-lying singlets undergoing on-chain ionization, followed by very rapid charge recombination. Threading is an efficient way to control charge recombination and to obtain a material suitable for photonic applications, where the push effect can be implemented for all-optical ultrafast switching. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.045111
DOI:
10.1103/PhysRevB.80.045111
PACS:
78.47.J−, 78.30.Jw, 78.55.Kz, 78.45.+h
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