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Dense TiO2 films grown by sol–gel dip coating on glass, F-doped SnO2, and silicon substrates

Published online by Cambridge University Press:  30 July 2012

Jan Prochazka
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Ladislav Kavan*
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Marketa Zukalova
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Pavel Janda
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Jaromir Jirkovsky
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Zuzana Vlckova Zivcova
Affiliation:
J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, CZ-18223 Prague 8, Czech Republic
Ales Poruba
Affiliation:
Solartec s.r.o., CZ-756 61 Rožnov pod Radhoštěm, Czech Republic
Mélanie Bedu
Affiliation:
SOLVIONIC S.A. Chemin de la Loge, F-31078 Toulouse, France
Markus Döbbelin
Affiliation:
IK4-CIDETEC, Donostia-San Sebastian 20009, Spain
Ramón Tena-Zaera
Affiliation:
IK4-CIDETEC, Donostia-San Sebastian 20009, Spain
*
a)Address all correspondence to this author. e-mail: kavan@jh-inst.cas.cz
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Abstract

Exceptionally dense titanium dioxide (TiO2) films were prepared via dip coating from a sol containing poly(hexafluorobutyl methacrylate) as the structure-directing agent. The films were grown on glass, F-doped SnO2, and crystalline silicon (111) faces, either pure or with a thin layer of SiO2. The TiO2 films cover perfectly even rough surfaces, which was ascribed to thixotropic properties of the precursor gel. The films provide antireflection function to crystalline Si wafers for photovoltaic applications. The optical reflectance in visible to near-infrared (NIR) wave lengths region is considerably smaller for Si wafers covered by TiO2/SiO2 film compared with that of SiO2/Si. The dense TiO2 films are amorphous with small amount of anatase and monoclinic TiO2(B). These two phases withstand calcination at 900 °C in films deposited on Si. For comparison, porous TiO2 films were grown by the same dip-coating protocol, but with alternative organic additives, either polymers or ionic liquids.

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Articles
Copyright
Copyright © Materials Research Society 2012

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