氮化鉭薄膜的結(jié)構(gòu)和電輸運(yùn)性質(zhì)研究
[Abstract]:Due to its superior physical, chemical and mechanical properties (such as high hardness, wear resistance, chemical inertia, thermal stability and low resistance temperature coefficient), 未 -TaNx materials with face-centered cubic structure are now being used in wear-resistant coatings. Thin film resistors and diffusion barriers in integrated circuits have been widely used. In addition, 未 -TaNx thin films have the characteristics of high superconducting transition temperature (6-10.5 K), small superconducting band-gap (1.24 meV) and low Fermi surface state density, so they are used in the next generation superconducting nanowire single-photon detectors. Metal-insulator-superconductor tunneling devices have potential applications. In this paper, a series of polycrystalline 未 -TaNx thin films with face-centered cubic structure have been successfully prepared on quartz glass substrate by RF magnetron sputtering and TaN target. The crystal structure, microstructure and electrical properties of the films have been systematically studied. The effects of sputtering conditions on the structure and electrical transport properties of 未 -TaNx thin films were analyzed, and the conduction mechanism of 未 -TaNx films at different temperatures was discussed. A series of 未 -TaNx polycrystalline films with FCC structure were grown on quartz glass by changing substrate temperature. The results of X-ray diffraction and SEM show that the average grain size of the films increases with the increase of substrate temperature. The results of electrical transport measurements show that 未 -TaNx films exhibit the same electrical transport properties as superconductor-insulator granular films below 5 K, and at 10-30 K, the films exhibit the properties similar to those of metal-insulator granular films at 10-30 K, and above 70 K, the films exhibit the properties similar to those of metal-insulator granular films at 10 ~ (-30) K. The thermal fluctuation induced tunneling (FIT) conduction mechanism dominates the temperature behavior of resistivity. Therefore, the particle like properties of polycrystalline 未 -TaNx film make it have high resistivity and negative resistance temperature coefficient. A series of 未 -TaNx thin films have been grown on quartz glass by changing the nitrogen partial pressure. The X-ray diffraction results show that the films are of face-centered cubic structure. The SEM results show that 未 -TaNx films have the properties of granular films. With the increase of nitrogen partial pressure, the crystalline quality of 未 -TaNx films becomes worse and the average particle size decreases. The results of electrical transport measurements show that the insulator-superconducting transition of the films disappears with the increase of nitrogen partial voltage in the temperature range below 5 K. In the temperature range above 10, the relationship between the resistivity and the temperature of the film is obviously different. For 未 -TaNx films prepared at 0.2and 0.94% nitrogen partial pressure, the electrical transport behavior in the whole temperature region of 10-350K is dominated by the conduction mechanism of FIT, while for 未 -TaNx films prepared at 5.39% and 7.50% nitrogen partial pressure, the conduction behavior below 50 K can be described by the variable path jump model of Mott. However, the conduction mechanism of fit still dominates the conduction behavior of the sample at 50 K or above.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TQ135.13;TB383.2
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