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Comparison of UV Irradiation and Sintering on Mesoporous Spongelike ZnO lms Prepared from PS-b-P4VP Templated Sol-Gel Synthesis
Tech Univ Munich, Dept Phys, Lehrstuhl Funkt Mat, James Franck Str 1, D-85748 Garching, Germany. .
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2018 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 1, no 12, p. 7139-7148Article in journal (Refereed) Published
Abstract [en]

Mesoporous ZnO films with large surface-area-to-volume ratio show great omise in multiple applications, among which solid-state dye-sensitized lar cells (ssDSSCs) have attracted great attention in the field of otovoltaics. An appropriate mesopore size in the nanostructured ZnO lms significantly plays an indispensable role in improving the device ficiency that resulted from an efficient penetration of dye molecules d solid hole transport material. In the present work, mesoporous ongelike ZnO films are prepared using sol-gel synthesis templated by a block copolymer polystyrene-block-poly(4-vinylpyridine). Two different mplate removal techniques, ultraviolet (UV) irradiation and gh-temperature sintering, are used to compare their respective impact the pore sizes of the final ZnO thin films. Both the surface rphology and the inner morphology show that mesopores obtained via UV radiation are smaller as compared to their sintered counterparts. reover, increasing the template-to-ZnO precursor ratio is found to rther enlarge present mesopores. Accordingly, a strong correlation tween the pore sizes of sol-gel synthesized ZnO films and photovoltaic rformance of fabricated ssDSSCs is demonstrated. In contrast with the vices fabricated from the UV-irradiated ZnO films, those obtained from ntered samples show >2 times higher efficiency.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 1, no 12, p. 7139-7148
Keywords [en]
UV irradiation, sintering mesopores, solid-state DSSCs, grazing-incidence small-angle X-ray scattering
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-248366DOI: 10.1021/acsanm.8b02039ISI: 000461401300068OAI: oai:DiVA.org:kth-248366DiVA, id: diva2:1302593
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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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