| Autor: |
Arion, Tiberiu, Nepp, Stefan, Roth, Friedrich, Shavorskiy, Andrey, Bluhm, Hendrik, Hussain, Zahid, Gessner, Oliver, Eberhardt, Wolfgang |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Appl. Phys. Lett. 106, 121602 (2015) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1063/1.4916278 |
| Popis: |
We report the site-specific probing of charge-transfer dynamics in a prototype system for organic photovoltaics (OPV) by picosecond time-resolved X-ray photoelectron spectroscopy. A layered system consisting of approximately two monolayers of C$_{60}$ deposited on top of a thin film of Copper-Phthalocyanine (CuPC) is excited by an optical pump pulse and the induced electronic dynamics are probed with 590 eV X-ray pulses. Charge transfer from the electron donor (CuPC) to the acceptor (C$_{60}$) and subsequent charge carrier dynamics are monitored by recording the time-dependent C 1$s$ core level photoemission spectrum of the system. The arrival of electrons in the C$_{60}$ layer is readily observed as a completely reversible, transient shift of the C$_{60}$ associated C 1$s$ core level, while the C 1$s$ level of the CuPC remains unchanged. The capability to probe charge transfer and recombination dynamics in OPV assemblies directly in the time domain and from the perspective of well-defined domains is expected to open additional pathways to better understand and optimize the performance of this emerging technology. |
| Databáze: |
arXiv |
| Externí odkaz: |
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