Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 8: Thin film photovoltaics: oxides and nanostructures

DS 8.3: Talk

Monday, March 26, 2012, 17:00–17:15, H 2032

Sol-Gel Templated Zinc oxide Films for Solar Cell Application — •Kuhu Sarkar, Monika Rawolle, Eva M. Herzig, Weijia Wang, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany

Zinc oxide (ZnO) nanostructures are synthesized on silicon substrates forming different morphologies comprising of foam-like structures, worm-like aggregates, circular vesicles and spherical granules. The synthesis is using a sol-gel mechanism coupled with an amphiphilic diblock copolymer polystyrene-block-polyethyleneoxide, P(S-b-EO), acting as a template. The different morphologies are designed by adjusting the weight fractions of the good-poor solvent pair and the ZnO precursor, zinc acetate dihydrate (ZAD). To visualize the compositional boundaries of various morphologies, a ternary phase diagram is mapped. The surface morphologies of the ZnO nanostructure are studied with scanning electron microscopy (SEM). The inner structures of the samples are probed using grazing incidence small angle X-ray scattering, complementing the SEM investigations. X-ray diffraction measurements are performed to confirm the crystallization of the ZnO to the wurtzite polymorph phase upon calcination of the nanocomposite film in air.