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- W2532355839 abstract "Abstract Time-resolved two-photon photoemission (TR-2PPE) spectroscopy is employed to probe the electronic states of a C 60 fullerene film formed on highly oriented pyrolytic graphite (HOPG), acting as a model two-dimensional (2D) material for multi-layered graphene. Owing to the in-plane sp 2 -hybridized nature of the HOPG, the TR-2PPE spectra reveal the energetics and dynamics of photocarriers in the C 60 film: after hot excitons are nascently formed in C 60 via intramolecular excitation by a pump photon, they dissociate into photocarriers of free electrons and the corresponding holes, and the electrons are subsequently detected by a probe photon as photoelectrons. The decay rate of photocarriers from the C 60 film into the HOPG is evaluated to be 1.31 × 10 12 s −1 , suggesting a weak van der Waals interaction at the interface, where the photocarriers tentatively occupy the lowest unoccupied molecular orbital (LUMO) of C 60 . The photocarrier electron dynamics following the hot exciton dissociation in the organic thin films has not been realized for any metallic substrates exhibiting strong interactions with the overlayer. Furthermore, the thickness dependence of the electron lifetime in the LUMO reveals that the electron hopping rate in C 60 layers is 3.3 ± 1.2 × 10 13 s −1 ." @default.
- W2532355839 created "2016-10-28" @default.
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- W2532355839 date "2016-10-24" @default.
- W2532355839 modified "2023-09-26" @default.
- W2532355839 title "Direct observation of photocarrier electron dynamics in C60 films on graphite by time-resolved two-photon photoemission" @default.
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- W2532355839 doi "https://doi.org/10.1038/srep35853" @default.
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