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O: Fachverband Oberflächenphysik
O 43: Inorganic/Organic Interfaces: Electronic Properties I
O 43.1: Hauptvortrag
Mittwoch, 18. März 2015, 10:30–11:00, MA 005
Electronic Interactions and Ultrafast Carrier Dynamics at Hybrid Organic / Inorganic Interfaces — •Oliver L.A. Monti — Department of Chemistry and Biochemistry, The University of Arizona, Tucson, AZ 85721, USA
Hybrid organic / inorganic interfaces play a central role in efficient carrier collection and extraction in next-generation organic optoelectronics. Here, I will discuss the consequences of electronic coupling at hybrid interfaces on electronic structure and ultrafast carrier dynamics for the prototypical case of highly conductive ZnO films. The presence of shallow donor states near the conduction band minimum leads to strong coupling across interfaces with organic acceptors such as C60 and PTCDA, unambiguously manifested by both charge-transfer and hybridization at the interface. Such interactions have dramatic effects on ultrafast carrier dynamics at the interface, lengthening times for escape from the interface by at least two orders of magnitude. I will show how interfacial coupling can be controlled readily with the chemical potential and further discuss the nature of relevant gap states, as revealed by two-photon photoemission spectroscopy. The results have broad implications for efficient charge harvesting and injection at hybrid interfaces.