Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster: Organic-Inorganic Hybrid Systems and Organic Films

O 42.4: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Investigation of Metal-Organic Interfaces by Adsorption Calorimetry — •Maik Schöniger, Martin Schmid, and J. Michael Gottfried — Fachbereich Chemie, Philipps-Universität Marburg

Measuring heats of adsorption and reaction by desorption-based techniques such as temperature-programmed desorption (TPD/TDS) is more challenging than it might seem at first view, because even small organic molecules such as benzene decompose before they desorb from reactive surfaces such as Pt(111). In these cases, where irreversible adsorption occurs, TPD fails. Instead, direct calorimetric measurements of the heats released during adsorption have to be performed. The same is true for adsorption processes which have an activation barrier. With our adsorption calorimeter, heats of adsorption and reaction can be determined directly for a large variety of systems, including the adsorption of metals and organics on metal surfaces or the reaction of metals with organic films. Metal-organic interface energies are of special importance for the design and development of future organic electronic devices such as organic light-emitting diodes (OLEDs) or organic solar cells (OSCs). Here, we discuss interfaces of low work function electrode metals such as Ca with organic semiconductors. Besides the interface energies, we also obtained data on the transmittance of thin metal films for IR radiation.