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Oxygen-related band gap state in single crystal rubrene

Mitrofanov, O; Lang, DV; Kloc, C; Wikberg, JM; Siegrist, T; So, WY; Sergent, MA; (2006) Oxygen-related band gap state in single crystal rubrene. PHYS REV LETT , 97 (16) , Article 166601. 10.1103/PhysRevLett.97.166601. Green open access

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Abstract

A molecular exciton signature is established and investigated under different ambient conditions in rubrene single crystals. An oxygen-related band gap state is found to form in the ambient atmosphere. This state acts as an acceptor center and assists in the fast dissociation of excitons, resulting in a higher dark and photoconductivity of oxidized rubrene. The band gap state produces a well-defined photoluminescence band at an energy 0.25 eV below the energy of the 0-0 molecular exciton transition. Two-photon excitation spectroscopy shows that the states are concentrated near the surface of naturally oxidized rubrene.

Type: Article
Title: Oxygen-related band gap state in single crystal rubrene
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.97.166601
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.97.166601
Language: English
Additional information: © 2006 The American Physical Society
Keywords: PENTACENE, GROWTH
URI: http://discovery.ucl.ac.uk/id/eprint/118125
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