Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 45: ZnO II

HL 45.12: Talk

Thursday, March 29, 2007, 17:00–17:15, H17

Aqueous chemical growth and application of ZnO nanorods — •Bianca Postels, Anna Kasprzak, Augustine Che Mofor, Hergo-Heinrich Wehmann, Andrey Bakin, and Andreas Waag — Institute of Semiconductor Technology, Technical University Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany

ZnO finds applications in many fields from sun tan lotion to optoelectronic applications. Especially the tendency of ZnO to form nanostructures opens the path to even more applications. A very promising fabrication process for ZnO nanostructures is the aqueous chemical growth (ACG), since it is a cost efficient and low temperature approach. Using this growth technique we generated wafer-scale ZnO nanorod arrays on Si, sapphire, ITO coated glass and even on flexible polymer substrates. ACG is found to be only weakly influenced by the substrate material and we are also able to control the dimensions of the ZnO nanorods. Another benefit of ACG is the ability to fabricate patterned arrays of ZnO nanorods by a selective growth process on structured metallised surfaces. Results of structural analysis with SEM and XRD are reported. Additionally, optical properties were investigated by PL measurements. First attempts on the preparation of dye sensitised solar cells (DSSCs) are also reported. Here, the traditional sintered TiO2 nanoparticles are replaced by a densely packed and vertically aligned array of ACG ZnO nanorods. The size and morphology of the ZnO nanorods can be controlled. The influence of the length of the nanorods on the cell properties is investigated. A vapour phase transport technique was also used as alternative growth method.