TY - JOUR
T1 - Nanocrystalline anatase TiO2 derived from a titanate-directed route for dye-sensitized solar cells
AU - Hsiao, Po Tsung
AU - Wang, Kai Ping
AU - Cheng, Chih Wei
AU - Teng, Hsisheng
N1 - Funding Information:
This research was supported by the National Science Council of Taiwan, through Projects NSC 94-2214-E-006-007 and NSC 95-2120-M-006-001.
PY - 2007/4/30
Y1 - 2007/4/30
N2 - TiO2 nanoparticles used in numerous applications are generally prepared from the sol-gel method. Because of the competitive, rather than exclusive, formation of the three TiO2 polymorphs, anatase, brookite and rutile, in the sol-gel synthesis, phase-pure nanoparticles can hardly be obtained. The present work demonstrates a unique route, alternative to the conventional sol-gel method, to prepare high-purity anatase TiO2 colloids, which can be deposited as electrodes for dye-sensitized solar cells (DSSCs) to facilitate electron transport and avoid charge recombination. In this developed route, a titanate with its TiO6 octahedra arranged in a zigzag configuration, which is also a characteristic feature of anatase TiO2, is produced as an intermediate. Raman analysis shows that a phase-pure anatase TiO2 colloid is prepared from the developed route, while the TiO2 derived from the sol-gel at the same temperature is predominantly composed of anatase with the presence of a minute amount of rutile and brookite. Because of the high-purity in anatase phase, the TiO2 colloid derived from the titanate-directed route is shown to constitute a mesoporous film exhibiting high performance in a dye-sensitized solar cell.
AB - TiO2 nanoparticles used in numerous applications are generally prepared from the sol-gel method. Because of the competitive, rather than exclusive, formation of the three TiO2 polymorphs, anatase, brookite and rutile, in the sol-gel synthesis, phase-pure nanoparticles can hardly be obtained. The present work demonstrates a unique route, alternative to the conventional sol-gel method, to prepare high-purity anatase TiO2 colloids, which can be deposited as electrodes for dye-sensitized solar cells (DSSCs) to facilitate electron transport and avoid charge recombination. In this developed route, a titanate with its TiO6 octahedra arranged in a zigzag configuration, which is also a characteristic feature of anatase TiO2, is produced as an intermediate. Raman analysis shows that a phase-pure anatase TiO2 colloid is prepared from the developed route, while the TiO2 derived from the sol-gel at the same temperature is predominantly composed of anatase with the presence of a minute amount of rutile and brookite. Because of the high-purity in anatase phase, the TiO2 colloid derived from the titanate-directed route is shown to constitute a mesoporous film exhibiting high performance in a dye-sensitized solar cell.
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U2 - 10.1016/j.jphotochem.2006.11.013
DO - 10.1016/j.jphotochem.2006.11.013
M3 - Article
AN - SCOPUS:33947507998
VL - 188
SP - 19
EP - 24
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
IS - 1
ER -