Exciton dynamics at interfaces of organic semiconductors |
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Authors: | Matthias Muntwiler Qingxin Yang X.-Y. Zhu |
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Affiliation: | aDepartment of Chemistry, University of Minnesota, 207 Pleasant St SE, Minneapolis, MN 55455, USA |
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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. |
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Keywords: | Organic semiconductor Fullerene Pentacene Exciton dynamics Photoelectron spectroscopy |
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