2021 年 141 巻 3 号 p. 197-201
Ti-doped vanadium dioxide (V0.75Ti0.25O2) thin films were fabricated by metal-organic decomposition (MOD). Precursor films were fabricated at a temperature of Tp = 300 ºC for 15 min in a N2 atmosphere. Then, these precursor films were fired at Tf = 520~600 ºC for tf = 15~45 min in a N2 atmosphere. From X-ray diffraction (XRD) patterns of the fired films, diffraction peaks indicating VO2(M) phase were observed with a wide range of Tf = 540~600 ºC. Furthermore, the peaks indicating VO2(M) phase were also observed with a wide range of tf = 15~45 min. Regarding the surface morphology of the films, the nanoparticles of 100~200 nm were densely packed. From R-T characteristics of the films, the phase transition with a rapid resistance change and hysteresis loop disappeared completely at Tf = 560~600 ºC. Relatively flat temperature dependence of the temperature coefficients of resistance (TCR) as high as -3.2~-6.2 %/K at the temperature range from 20 ºC to 80 ºC was obtained for the film fired at Tf = 580 ºC. From these experimental results, it was found that wide windows of firing conditions for fabricating V0.75Ti0.25O2 thin film can be obtained in the MOD process.
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