Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Poster: Organic Electronics and Photovoltaics
CPP 27.5: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Controlling the morphology of thin titania films for applications in hybrid solar cells — •Monika Rawolle1, Matthias A. Ruderer1, Stefan Prams1, Qi Zhong1, Mine Memesa2, Jochen S. Gutmann2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department LS E13, James-Franck-Str. 1, D-85747 Garching (Germany) — 2Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz (Germany)
Nanostructured thin films of titania have a variety of applications. For applications in photovoltaics a high absorption coefficient and a large surface area are desirable. A sponge structure is a promising morphology for titania to meet these demands. Block copolymers can be used in a good-poor solvent pair induced phase separation process coupled with sol-gel chemistry to create structured titania films in a reproducible way. We use the amphiphilic diblock copolymer Poly(dimethyl siloxane)-block-methyl methacrylate poly(ethylene oxide) [PDMS-b-MA(PEO)] as templating agent.[1] Different well defined mixing procedures of sol-gel components (Tetrahydrofuran, 2-Propanol, HCl and titania precursor in addition to the PDMS-b-MA(PEO)) of same weight fractions result in small changes in the morphology of the film. The thin films are prepared via spin-coating on silicon substrates. The surface structure is studied with SEM. Information on the morphology in the volume of the film is gained from GISAXS. The layer thickness and structure are studied with XRR, the optical properties with UV/Vis spectroscopy.
[1] G. Kaune et al., ACS Appl. Mater. Interfaces, in press