Crack-Free TiO2 Thin Film By 3D Printing Method: Investigation On Resistivity Effect

Aran Hansuebsai and Krairop Chareonsopa, Chulalongkorn University

TiO2 thin films were fabricated on FTO glass substrates by a three-dimensional (3D) printing method based on low temperature deposition manufacturing (LDM). This technology consists of the additive multilayer deposition of TiO2 dispersion. The aim was to study the possibility of using a  low-cost benchtop 3D printer equipped with a syringe dispenser to fabricate the TiO2 thin film. This technique has advantages for variable patterns and the number of printed layer. However, the possibility to get a crack thin film is high at increasing its thickness. Therefore, this research was to investigate the limitation of printer’s parameters such as nozzle size, printing speed, air pressure and the distance between the nozzle tip and the substrate to achieve the satisfied results. The thin films were characterized by SEM images and their electrical resistivity was examined. From this study, a crack-free of TiO2 thin film was obtained and this thin film could be used for the application of dye sensitized solar cell later.