Polymer templated nanocrystalline titania network for solid state dye sensitized solar cells

Titelangaben

Brendel, Johannes C. ; Lu, Yan ; Thelakkat, Mukundan:
Polymer templated nanocrystalline titania network for solid state dye sensitized solar cells.
In: Journal of Materials Chemistry. Bd. 20 (2010) Heft 34 . - S. 7255-7265.
ISSN 1364-5501
DOI: https://doi.org/10.1039/C0JM00916D

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Abstract

We report a novel preparation method for nanocrystalline TiO2 networks with controlled pore sizes
using spherical polyelectrolyte brushes (SPB) as templates. The SPB consists of a solid polystyrene core
from which anionic polyelectrolytes are densely grafted. The SPB templates are synthesized via
conventional photoemulsion polymerization with efficient control of core size and brush length.
Subsequently, the TiO2 precursor is hydrolyzed at room temperature within the anionic brush to obtain
anatase nanocrystals of 12-20 nm size. These stable and form-persistent composite particles of SPB
decorated with anatase nanocrystals are then assembled on a conductive substrate. The subsequent
calcination of this composite layer leads to a robust nanocrystalline TiO2 network, in which the pores
and the wall thickness are directly correlated to the polystyrene core size and the amount of TiO2
hydrolyzed within the brush respectively. In this study, we optimized different thin-film preparation methods and characterized the resulting nanocrystalline TiO2 networks using SEM and XRD.
Moreover, the applicability of these nanocrystalline networks as electron transport layers are tested in solid-state dye-sensitized solar cells (SDSCs). The first test devices exhibited efficiencies up to 0.8%. The precise and individual control of parameters such as porosity, thickness and crystallinity makes this concept highly attractive for the realization of efficient solid-state hybrid devices.