1.Key Laboratory of Micro/Nano Devices and Systems,Ministry of Education,North University of China,Taiyuan 030051,China
2.State Key Laboratory of Extreme Environment Optoelectronic Dynamic Measurement Technology and Instrument,North University of China,Taiyuan 030051,China
The crystal structure of TiO2 films is a key factor in determining their core properties, such as their photo-catalytic and optical performance. Meanwhile, sputtering power density indirectly influences the crystallization behaviour of films by regulating the deposition temperature. In this study, a quantitative model relating sputtering power density and deposition temperature was established, and a multi-physics simulation method was used to thoroughly investigate the regulation mechanism of sputtering power density on the crystallization behavior of TiO2 films. Simulation results show that when the sputtering power density increases from 0.83 W/cm² to 5.00 W/cm², the surface temperature of the film during growth rises from 197 ℃ to 541 ℃, and the substrate temperature rises from 125 ℃ to 324 ℃, with the surface temperature always higher than the substrate (temperature difference 72-217 ℃). When the surface temperature of the growing film is below 400 ℃, it is in an amorphous state; above 400 ℃, it transforms into the anatase phase, and the film’s crystalline structure is mainly determined by the growth surface temperature. This simulation work clarifies the critical role of temperature in the phase transformation of TiO2 films, provides a theoretical basis for precise control of film crystal structures, and has significant implications for the industrial application of high-performance TiO2 films.
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