Cathodic electrophoretic deposition (EPD) of commercially available TiO2 nanocrystals (P-25 and P-90, Degussa) for the formation of nanoporous electrodes for dye-sensitized solar cells (DSSCs) is reported. Thick, uniform, adherent TiO2 films were obtained from alcoholic suspensions prepared in two steps: first, nanoparticles were treated in an alcoholic suspension with a small amount of acetylacetone; second, the obtained suspension was mixed with a EPD "charging solution" with small additives of iodine, acetone and water. A modified mechanical compression technique was employed to the electrophoretically deposited films to vary the porous structure and thickness of TiO2 layers. By applying non-polar volatile organic liquids to fill the pores of dry TiO2 films before compression, we obtained a substantial improvement in the quality of the pressed films. The fabrication of multilayer electrodes enabled us to obtain TiO2 films with a thickness up to 25 μm and the photoelectric conversion efficiency up to 8.5% under 1 sun illumination.
|Number of pages||8|
|Journal||Journal of Photochemistry and Photobiology A: Chemistry|
|State||Published - 5 Jul 2008|
Bibliographical noteFunding Information:
The authors thank the Israeli Ministry of Science for funding this research. The authors also thank Degussa AG (Germany) for the kind gift of the P-90 TiO 2 nanopowder, and Dr. Judith Grinblat for the HRTEM images.
- Dye-sensitized solar cell
- Electrophoretic deposition