Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.72: Poster

Tuesday, March 13, 2018, 18:15–20:15, Poster B

Controlling the work function of metals by means of phthalocyanine thin films — •Felix Widdascheck, Alrun Hauke, and Gregor Witte — Molekulare Festkörperphysik, Philipps-Universität Marburg, Renthof 7, D-35032 Marburg, Germany

Efficient charge transfer at the interface between organic semiconductors and the respective device electrodes is of key importance for the advancement of organic electronics. It depends crucially on the energy level alignment and the reduction of potential injection barriers at such interfaces. A promising approach to effectively tune work functions and therefore optimize interface energetics are monolayers of flat lying molecules as contact primers. Compared to self-assembled monolayers they promise lower contact resistance due to shorter tunneling distances. Due to their high flexibility and flat absorption geometry phthalocyanines are an ideal model system to identify important parameters for this process. The presented study combines STM and Kelvin Probe measurements to compare the effect of highly ordered thin films of different phthalocyanines on the work function of metals and their possible use as contact primers. An additional focus is the importance of structural order and the influence of adsorbed film thickness.