Dresden 2009 – scientific programme
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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 5: Organic Photovoltaics III
SYOP 5.8: Talk
Friday, March 27, 2009, 12:15–12:30, ZEU 222
Growth and morphology of photoactive small organic molecules on device-relevant substrates — •Jonathan Heidkamp1, Ayse Turak2, Felix Maye1,2, and Helmut Dosch1,2 — 1Universität Stuttgart — 2Max-Planck-Institut für Metallforschung Stuttgart
Indium-Tin-Oxide (ITO) is a commonly used electrode in organic solar cells. However, the performance of these devices depends crucially on the characteristics of the interface between the ITO and the photoactive organic layer.
To study the interface characteristics, we investigated the growth, morphology, structure and ordering of small organic molecules, diindenoperylene (DIP) and perylene tetracarboxylic di-imide (PTCDI), on SiO2, ITO and modified ITO substrates by atomic force microscopy and x-ray measurements.
Both molecules formed well ordered multilayer structures on all investigated substrates. However, only DIP showed a substrate dependence in the growth behaviour and stability, indicating different interfacial interactions for the two molecules. These differences in growth and especially in stability for different substrates can have significant implications for the use of DIP and PTCDI in organic devices.