%0 Journal Article
%A Rawolle, M.
%A Ruderer, M. A.
%A Prams, S. M.
%A Zhong, Q.
%A Magerl, D.
%A Perlich, J.
%A Roth, S. V.
%A Lellig, P.
%A Gutmann, J. S.
%A Müller-Buschbaum, P.
%A DESY
%T Nanostructuring of titania thin films by combination of micro-fluidics and block copolymer based sol-gel templating
%J Small
%V 7
%@ 1613-6829
%C Weinheim
%I Wiley-VCH Verl.
%M PHPPUBDB-19406
%P 884-891
%D 2011
%X Sol-gel templating of titania thin films with the amphiphilic diblock copolymer poly(dimethyl siloxane)-block-methyl methacrylate poly(ethylene oxide) is combined with microfluidic technology to control the structure formation. Due to the laminar flow conditions in the microfluidic cell, a better control of the local composition of the reactive fluid is achieved. The resulting titania films exhibit mesopores and macropores, as determined with scanning electron microscopy, X-ray reflectivity, and grazing incidence small angle X-ray scattering. The titania morphology has three features that are beneficial for application in photovoltaics: 1) a large surface-to-volume ratio important for charge generation with disordered hexagonally arranged mesopores of 25 nm size and a film porosity of up to 0.79, 2) enhanced light scattering that enables the absorption of more light, and 3) a dense titania layer with a thickness of about 6 nm at the substrate (bottom electrode) to prevent short circuits. An optical characterization complements the structural investigation.
%K Microfluidics
%K Microscopy, Electron, Scanning
%K Nanostructures: chemistry
%K Phase Transition
%K Polymers: chemistry
%K Porosity
%K Surface Properties
%K Titanium: chemistry
%K X-Rays
%K Polymers (NLM Chemicals)
%K titanium dioxide (NLM Chemicals)
%K Titanium (NLM Chemicals)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:21337509
%U <Go to ISI:>//WOS:000289378000006
%R 10.1002/smll.201001734
%U https://bib-pubdb1.desy.de/record/95551