Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5396713 | Journal of Electron Spectroscopy and Related Phenomena | 2009 | 9 Pages |
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(1Â 1Â 1) and Cu(1Â 1Â 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
Authors
Matthias Muntwiler, Qingxin Yang, X.-Y. Zhu,