Article ID Journal Published Year Pages File Type
5396713 Journal of Electron Spectroscopy and Related Phenomena 2009 9 Pages PDF
Abstract
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: C60 and pentacene. For C60 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 C60, 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.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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