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Photoconductive properties of titanium dioxide film modified by femtosecond laser irradiation |
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| Authors: | M. Tsukamoto T. Shinonaga M. Takahashi M. Fujita N. Abe |
| Affiliation: | 1. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan 2. Graduate School of Engineering, Osaka University, 1-1 Yamadaoka, Suita, Osaka, 565-0871, Japan 3. Osaka Municipal Technical Research Institute, 1-6-50 Morinomiya, Joto-ku, Osaka, Osaka, 536-8553, Japan 4. Institute for Laser Technology, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan |
| Abstract: | Titanium dioxide (TiO2) films were irradiated with a femtosecond laser to alter their photoconductive properties. The laser wavelength and pulse duration were 775 nm and 150 fs, respectively. The TiO2 films irradiated with the femtosecond laser were darkened without changing the topography of the TiO2 film surface. The electrical resistances of the films as a function of time were measured under visible-light illumination. The transient electrical resistances decreased as time was increased after turning on the light. There were two stages in the reduction process of the electrical resistance. |
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