Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 174, Issue 1-3, Pages 116-124Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.elspec.2009.02.016
Keywords
Organic semiconductor; Fullerene; Pentacene; Exciton dynamics; Photoelectron spectroscopy
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Funding
- National Science Foundation [DMR-0804583]
- MRSEC [DMR-0819885]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0946346] Funding Source: National Science Foundation
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We review recent progress of using time-resolved two-photon photoelectron spectroscopy (2PPE) to study the energetics and dynamics of excitons at surfaces and interfaces of two prototypical organic semiconductors: C(60) and pentacene. For C(60) thin films epitaxially grown on Au(1 1 1) and Cu(1 1 1) surfaces, we observe both charge transfer and exciton states. For excitons in C(60), the proximity of a metal Surface leads to rapid, exciton band-mediated quenching. At the surface of pentacene thin films we observe a series of charge-transfer excitons where the electron and the photohole are bound across the interface. The ability of 2PPE to measure and directly relate exciton levels to single-electron levels is illustrated. (C) 2009 Elsevier B.V. All rights reserved.
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