Heat treatment effects on the optical properties of Sol–gel Ta2O5 thin films |
| |
Authors: | Farhad E. Ghodsi Fatma Z. Tepehan |
| |
Affiliation: | Department of Physics, Faculty of Science and Letters, Istanbul Technical University, Maslak, Istanbul 80626, Turkey |
| |
Abstract: | In this work optical properties of Ta2O5 thin films with respect to heat treatment temperature were investigated. Ta2O5 thin films were prepared by sol–gel process using dip-coated method with a constant speed of 107 mm/min. Optical properties have been calculated from optical transmission measurements as a function of heat treatment temperature. The refractive indices and absorption coefficients were affected by heat treatment. The refractive index at λ=550 nm increased from 1.84 to 2.04 and absorption coefficient increased from 241 to 5668 cm−1 when heat treatment temperature increased from 100°C to 500°C. The thickness of the film decreased from 272 to 190 nm and their optical band gap decreased from 3.68±0.09 eV to 3.51±0.08 eV for the film heated from 100°C to 500°C. |
| |
Keywords: | Tantalum pentoxide Sol– gel Optical properties Thin films Heat treatment effect |
本文献已被 ScienceDirect 等数据库收录! |