Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Organic electronics and photovoltaics III (O, jointly with CPP, DS, HL)
HL 63.6: Vortrag
Mittwoch, 13. März 2013, 17:15–17:30, H33
Defect-Driven Interfacial Electronic Structure at a Hybrid Organic / Inorganic Heterojunction — •Oliver Monti1, Leah Kelly1, Laura Schirra1, Paul Winget2, Hong Li2, and Jean-Luc Bredas2 — 1The University of Arizona, Tucson, AZ, USA — 2Georgia Institute of Technology, Atlanta, GA, USA
We present a combined experimental and theoretical study of the interfacial electronic structure of highly defined thin films of organic semiconductors on ZnO. We discuss the importance of shallow donor states in the near-surface region of ZnO in determining energy-level alignment and electronic structure at such interfaces. Using ultraviolet and x-ray photoelectron spectroscopy together with two-photon photoemission and first-principles calculations we investigate the nature of hybrid interface states inside the bandgap of ZnO. These states display strong charge-transfer character and may play an important role in charge-harvesting events in organic photovoltaic cells.