Ultrafast electron transfer from oligo(p-phenylene-ethynylene)thiol to gold
Li Wang1, Wei Chen, Chun Huang
1Department of Physics, National University of Singapore, Singapore 117542, and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore. phywl@nus.edu.sg
Abstract:
The electron transfer dynamics of oligo(p-phenylene-ethynylene) (OPE) SAM on Au(111) was studied by resonant photoemission spectroscopy. The ultrafast electron transfer from OPE molecules to Au substrate was clearly observed. The time scale for this charge transfer is much less than 6 fs, the core-hole lifetime for C 1s. This strongly suggests that there is an intense interfacial electronic coupling between OPE molecules and the Au substrate.
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