Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Organic semiconductors II (joint session HL/CPP)

HL 48.2: Talk

Wednesday, March 18, 2020, 15:30–15:45, POT 112

Photoemission Spectroscopy of Organic Charge Transfer Interfaces — •Robert Kuhrt, Martin Hantusch, and Martin Knupfer — IFW Dresden, Helmholtzstraße 20, 01069 Dresden

Understanding physical processes at interfaces involving organic semiconductors plays a key role in optimizing the performance of electronic devices such as solar cells, where absorber and transport layers form interfaces involving metals as well as organic semiconductors. Furthermore, charge transfer between organic molecules might result in interesting properties such as metallic conductivity or correlated electronic states like superconductivity.
In this contribution, we present photoemission spectroscopy studies of various interfaces involving the strong electron acceptor hexafluorotetracyanonaphthoquinodimethane (F6TCNNQ). We compare the electronic properties of organic based donor, acceptor systems. Significant changes are observed in both the core levels and the valence orbitals at the interface, indicating a charge transfer between the materials. Origin and character of the charge transfer as well as the influence of substrate and film structure are discussed.
Acknowledgement: Financial support by the DFG (KN393/25; KN393/26) is gratefully acknowledged.