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Impact of Catalytic Additive on Spray Deposited and Nanoporous Titania in Films Observed via in Situ X-ray Scattering: Implications for hanced Photovoltaics
Tech Univ Munich, Lehrstuhl Funkt Mat, Dept Phys, James Franck Str 1, D-85748 Garching, Germany. chwartzkopf, Matthias; Roth, Stephan V..ORCID iD: 0000-0003-2865-2265
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2018 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 1, no 8, p. 4227-4235Article in journal (Refereed) Published
Abstract [en]

With the aim of obtaining nanostructured titania thin films for the tential use in hybrid or dye sensitized solar cells, the amphiphilic block copolymer polystyrene-b-poly(ethylene oxide) is employed as a ructure directing template in combination with solgel chemistry. For sy upscaling, spraying is used as a deposition technique. In situ azing incidence small-angle X-ray scattering (GISAXS) measurements are rformed during spraying and show that most titania structures are ready formed within the solution prior to deposition. However, ructural rearrangement is enabled during the deposition period when all amounts of hydrochloric acid (HCl) are used as a catalytic ditive to the spray solution. This behavior is ascribed to an altering the reaction dynamics and phase separation in the presence of HCl, ich significantly improves the templating effect of the employed block copolymer. With HCl as an additive the final nanoscale rphologies exhibit smaller pore sizes and strongly enhanced order as mpared to thin films sprayed from solutions that do not contain HCl as antified with atomic force microscopy, scanning electron microscopy, d GISAXS.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 1, no 8, p. 4227-4235
Keywords [en]
nanostructure, titanium dioxide, GISAXS, diblock copolymer template, sol-gel
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URN: urn:nbn:se:kth:diva-248367DOI: 10.1021/acsanm.8b00985ISI: 000461400900052OAI: oai:DiVA.org:kth-248367DiVA, id: diva2:1302590
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QC 20190405

Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05Bibliographically approved

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Roth, Stephan V.

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