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Synthesis and characterization of mesoporous TiO2 nanostructured films prepared by a modified sol-gel method for application in dye solar cells |
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| Authors: | EC MunizMS Góes JJ SilvaJA Varela E JoanniR Parra PR Bueno |
| Affiliation: | a Departamento de Físico-Química, Instituto de Química, UNESP, R. Francisco Degni s/n, CEP.: 14800-900, Araraquara, SP, Brazil b Centro de Tecnologia da Informação Renato Archer, Rodovia Dom Pedro I (SP - 65) Km 143,6, CEP.: 13069-901, Campinas, SP, Brazil c Instituto de Investigaciones en Ciencia y Tecnología de Materiales (INTEMA), CONICET-UNMdP, J.B. Justo 4302, B7608FDQ Mar del Plata, Argentina |
| Abstract: | Anatase TiO2 colloidal dispersions were obtained by hydrothermal synthesis at 200 °C from titanium isopropoxide gels modified with acetic acid in the presence of a non-ionic surfactant. Absolute ethanol, anhydrous terpineol and ethyl cellulose were added to this anatase dispersion resulting in a 23 wt% TiO2 paste. Mesoporous films for application as working electrodes in dye-sensitized solar cells were prepared by the screen-printing method, yielding reproducible films with thicknesses about 10 μm and desired porosity levels in a single printing operation. An average energy conversion efficiency of 5.2%, and a fill factor of 0.66 were achieved with anatase particle sizes ranging between 15 and 20 nm. The reproducibility of the results was confirmed by electrochemical impedance spectroscopy analysis. |
| Keywords: | Nanoparticle TiO2 Sol-gel Hydrothermal synthesis DSC |
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