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.
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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 |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/118125 |
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