Structural and Morphological Characterization of an Organic Multilayer Photodiode with X-ray Scattering Techniques, SEM and AFM
Organic opto-electronic devices such as light emitting devices as well as organic photodiodes (OPDs) are generally constructed by sandwiching organic thin films between two metal electrodes. The growth of the different layers on top of each other occurs in a specific manner. In our case the OPDs consist of several stacked layers of a thin semitransparent gold layer, a copper phthalocyanine layer (CuPc) (hole transport layer), a perylene tetracarboxylic bisbenzimidazole (PTCBI) layer, an aluminium-tris(8-hydroxychinolin) (Alq3) layer (both electron transport layers) and a silver top electrode. All these layers were vacuum deposited at room temperature, except for the gold electrode, which was deposited by sputtering. The used substrate was on the one hand thermally oxidized silicon (SiOx) and on the other hand a flexible foil (Mylar).