Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 58: Organic Electronics and Photovoltaics III
(Joint session of CPP, DS, HL and O, organized by CPP)

DS 58.8: Talk

Friday, March 11, 2016, 11:30–11:45, H40

In-situ x-ray investigation of the structure formation of metal films on photoactive polymers — •Franziska C. Löhrer¹, Volker Körstgens¹, Matthias Schwartzkopf², Alexander Hinz³, Oleksandr Polonskyi³, Thomas Strunskus³, Franz Faupel³, Stephan V. Roth², and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — ²Deutsches Elektronensynchrotron DESY, 22607 Hamburg, Germany — ³CAU zu Kiel, Institut für Materialwissenschaft, LS Materialverbunde, 24143 Kiel, Germany

Photoactive polymers have received high attention in recent years due to a large variety of different applications in molecular electronics. Although organic materials are used in the active layers of these devices, typically in many cases the electrodes are still made from metals. Thus, the polymer-metal interfaces are inherently present in all these novel devices. Our work takes a deeper look at the morphology of interfaces between photoactive layers and metal contacts deposited on top of them. We investigate morphological changes during sputter deposition of metal films (electrodes) onto photoactive films using in-situ GISAXS. Probing the sputter process in-situ allows highly time resolved insights into the deposition behavior of the metal depending on the polymer layer's properties. The deposition behaviors of gold and aluminium are compared, as both metals are frequently used as electrodes. The photoactive films consist of the low band gap polymer PTB7 as well as of PTB7:PCBM blends. The final film morphology is characterized via SEM and XRR after sputter deposition.