Project B9: Electronic structure and ultrafast carrier dynamics at hybrid
Julia Stähler & Martin Wolf
Femtosecond time- and angle-resolved 2PPE
and time-resolved non-linear optical spectroscopy is used to investigate the occupied and unoccupied electronic band
structure, as well as the electron, hole, and exciton dynamics at HIOS interfaces. This will lead to a better understanding
of processes that crucially determine the opto-electronic functionality of HIOS, like interfacial
charge transfer, localization,
and relaxation phenomena. Another goal is to increase the complexity from UHV-prepared samples towards more realistic HIOS, which
will be accomplished in close cooperation within the CRC.
Figure: Energy levels at HIOS interfaces and illustration of the experimental principle. The presence of the surface leads to
band bending and the formation of surface states that are crucial for the alignment of the organic molecular orbitals.
The pump laser pulse creates electron-hole pairs and initiates electron (1), hole (2), and/or exciton (3) transfer across
the interface. Electronic structure and population dynamics are probed by time-resolved 2PPE and non-linear optical spectroscopy.
information on the research center can be found here: