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On the Optical Properties of Ag+15 Ion-beam-irradiated TiO2 and SnO2 Thin Films
Hardeep Thakur,K. K. Sharma,Ravi Kumar,Pardeep Thakur,Yogesh Kumar,Abhinav Pratap Singh,Sanjeev Gautam,채근화 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10
The effects of 200 MeV Ag<sup>+15</sup> ion irradiation on the optical properties of TiO<sub>2</sub> and SnO<sub>2</sub> thin films prepared by RF magnetron sputtering technique were investigated. These films were characterized by the UV-vis spectroscopy and it was observed that with increase in irradiation fluence the transmittance for the TiO<sub>2</sub> films systematically increases while that for SnO<sub>2</sub> decreases. Absorption spectra of the irradiated samples showed a minor changes in indirect bandgap from 3.44 to 3.59 eV for TiO<sub>2</sub> while that for SnO<sub>2</sub> significant modifications in the direct bandgap from 3.92 to 3.6 eV were observed on increasing irradiation fluence. The observed modifications in the optical properties of both TiO<sub>2</sub> and SnO<sub>2</sub> systems with irradiation can be attributed to controlled structural disorder/defects in the system.