Abstract
In order to make a dye-sensitized solar (DSC) cell, a Low-pressure Cold Spray (LCS) technique is used to make Ti02 film in this study. In our previous study, it was successful that dense and more than 15μm thick TiO_2 film can be obtained by the LCS. However, in the case of the DSC, the dense film is not good for power generation. It is better to obtain films with pores, high cohesive force, and suitable thickness. Therefore, the aim of this study is to make the porous and thick film, which was controlled by mixture TiO_2 powder with large and small diameters. It was made that several mixture TiO_2 powders with different proportion of large and small powders, and then a film was coated by the LCS. Moreover, the influence on the deposition efficiency and the film thickness in repetition film coating were evaluated. As a result, it is successful to make porous TiO_2 films controlled by proportion of large and small powder contents. And, it was made clear that use of small particles indicated high deposition efficiency. On the other hand, use of large particles indicated low deposition efficiency. Finally, the battery properties of the film made by the LCS was evaluated. As a result, conversion efficiencies of the film made by the LCS were less than 1% in any mixture ratio, because of inhomogeneous porosity. However, the LCS becomes an effective tool for making films for the DSC.
