Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 16: Organic Thin Films, Organic-Inorganic Interfaces

DS 16.3: Vortrag

Mittwoch, 3. April 2019, 10:00–10:15, H39

Vacuum-deposited organic monolayers for work function modification of noble metal electrodes — •Felix Widdascheck, Alrun Aline Hauke, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, D-35032 Marburg, Germany

The energy level alignment between organic semiconductors and the respective (metal) electrodes in organic electronic devices is of key importance for efficient charge carrier injection. For many years, researchers have attempted to control this energy level alignment by means of functional self-assembled monolayers (SAMs) or the insertion of thin injection layers (made e.g. of doped organic semiconductors or pure dopants). The present work demonstrates an alternative approach, namely the use of phthalocyanine monolayers as contact primers which are deposited onto noble metal electrodes by means of vacuum deposition. We show that polar as well as non-polar phthalocyanines modify the work functions of clean Au(111) and Ag(111) surfaces as a function of their coverage and thus enable quantitative control of the metal work functions. This behavior is successfully replicated for polycrystalline metal surfaces and it is found that full monolayers can even withstand air exposure when protected by sacrificial multilayers which are afterwards removed by thermal desorption.