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Rozprawy doktorskie na temat "Couches minces métalliques – Teneur en aluminium"
Liu, Tomin. "Electrodéposition de couches minces métalliques à partir de solutions de liquides ioniques pour des applications électroniques". Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0170/document.
Pełny tekst źródłaDeposition mechanisms from ionic liquid-based electrolytes are not fully understood due to difficulties in probing the electrolyte structure. In this study, we investigate the links between films morphology, electrochemical properties of the electrolyte and electrolyte structure. Several solutions were investigated: CuCl, CuCl2 and CuSO4 in 1-ethyl-3-methylimidazolium ethylsulphate [EMIM][EtSO4]; AgTFSI, CuTFSI2 and AlTFSI3 in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [EMIM][TFSI]. Cyclic-voltammetry shows that silver and copper reductions are quasi-reversible and occur by one-electron transfer reaction {(Ag(I)→Ag(0), (Cu(II)→Cu(I)) and (Cu(I)→Cu(0)}. Aluminium reduction is irreversible. The diffusion coefficients increase with electrolyte temperature, and are also influenced by the metal oxidation state and anions in solution. Metallic thin films were obtained for all the solutions except AlTFSI3. XRD and EDX analysis show that the films are crystalline and consist mainly of pure copper or silver. Their morphology is controlled by the deposition temperature, time and potential. In general, increasing the deposition time and temperature increases the film coverage and particle size, whereas increasing the deposition potential decreases the particle size. The electrolytes structure was investigated by Raman and IR spectroscopies, supported by theoretical calculations. For the AgTFSI-[EMIM][TFSI], silver cation is solvated by three TFSI-. For the CuCl2-[EMIM][EtSO4], copper cation is solvated by two chlorines and two EtSO4-
Gaci, Azzedine. "Etude de l'influence de la cinétique des traitements thermiques sur les excroissances de recuit des couches minces métalliques". Lyon, INSA, 1992. http://www.theses.fr/1992ISAL0041.
Pełny tekst źródłaThe dimension reduction of integrated circuits and the increase of their complexity involve that the response time is more and more limited by that of interconnections. The requirements for nationalizations are essentially: low resistivity and compatibility with the fabrication steps. For multilevel interconnections, aluminum alloys are widely used. These interconnections deposited onto silicon substrates are submitted to heat treatments witch generate plastic deformation partially not homogeneous and responsible in the hillocks appearance. The feasibility and reliability of integrated circuits are strongly limited by these hillocks. The hillocks characteristic determination has required the development of a quantitative statistic method. The accuracy and performance of this new method have been studied by simulation. This method has been used to study the effect on the hillocks formation of the heat treatments witch are characterized by the temperature and time annealing as well as heating speed. Experimental results have revealed the primordial role of heating speed. For low speeds, the numerous and high hillocks are formed during heating. For high speed, small and relatively rare, hillocks growing during stress relaxation. Direct study of this mechanism allows the determination of an apparent activation energy witch was estimated to 0. 5 ev. This result supports inter granular diffusion controlled creep as an active, plastic deformation mechanism. A modelisation of stress relaxation during thermal cycle allows us to confirm the predominant role of inter granular diffusion in matter transport to form hillocks. A high heating speed at high temperature appears an e active way for eliminating hillocks in integrated circuits metallization
Martegoutte, Julien. "Corrélation entre les procédés de fabrication, les propriétés microstructurales et les propriétés mécaniques de couches minces métalliques pour applications microsystèmes". Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00770667.
Pełny tekst źródłaMalaurie, Agnès. "Modélisation des mécanismes de transport de la vapeur métallique dans les techniques de dépôt physique en phase vapeur". Limoges, 1995. http://www.theses.fr/1995LIMO0023.
Pełny tekst źródłaNtomprougkidis, Vitalios. "Étude de l'interaction micro-décharges / surfaces métalliques pour une meilleure compréhension des mécanismes de croissance lors du procédé PEO". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0077.
Pełny tekst źródłaPlasma electrolytic oxidation (PEO) is an electrochemical surface processing technique that allows the growth of protective oxide films on lightweight metals (Al, Ti, Mg). Contrary to conventional anodising, PEO operates at high current density and voltage which results in the ignition of micro-discharges (MDs) over the processed surface The aim of this work was to investigate the characteristics of the MDs under different processing parameters and to correlate these characteristics with the microstructure of the produced oxide layers in order to better understand the oxide growth mechanisms. Firstly, PEO sequenced treatments were conducted by changing the electrical parameters in the course of a treatment. Results revealed a particular behaviour of the MDs which depends not only on the applied electrical parameters but also on the morphology of the growing layer. Results also evidenced an earlier transition to the beneficial “soft” sparking regime, contributing to a significant improvement of the microstructure of the oxide layer as well as process energy consumption. Time-resolved optical characterizations of the PEO process pointed out a correlation between ignition of MDs and the dynamic of the surrounding gas bubbles at the oxide / electrolyte interface. Particularly, results proved the existence of inner MDs during the “soft” sparking regime. Secondly, a multi-scale characterization of the typical “pancake” structure formed during the transition to the “soft” regime revealed the formation of a lamellar nanocomposite structure consisting of periodical alternations of alumina and metastable 1:1 mullite lamellae. Finally, two new opportunities for the PEO process were explored. The feasibility of duplex treatment involving cold-spray and PEO technologies was demonstrated and the possibility to produce metallic oxide (nano-) particles was proposed
Othman, Mehdi. "Effet des nanograins métalliques sur les propriétés de détection des capteurs de gaz à base de WO3". Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4360.
Pełny tekst źródłaThis work focuses on improving the performance of WO3-based gas sensors with particular attention to the effect of metal additives on device sensing properties. The goal is to assess and improve the performance of sensors under different oxidizing and reducing gases. Two approaches have been taken: a theoretical approach which consists in the modeling of gas sensor resistance and an experimental approach which consists in modifying the surface of the sensitive layers by metal nanograins. The developed model allowed us to highlight the various intrinsic and structural parameters of the sensitive layer, in which it is possible to act to improve the performance of the sensors. The second approach is to add metallic nanograins. This method shows high efficiency on the sensor performance. Indeed, the results obtained with the gold nanoparticles show improved response, response and recovery times, and the time stabilization under ozone. It is the same for the additions of silver and palladium nanoparticles, even if the results are different. In the case of adding cobalt nanoparticles, a singular phenomenon is manifested by the sensor responses inversion in some cases. This property can be exploited for the selective detection of different gases, with the same sensitive layer modified by the addition of very small quantities of material
Chenoufi, Adel. "Structure et comportement thermodynamique des alliages métastables Ni-Ag et Al-Mn". Rouen, 1988. http://www.theses.fr/1988ROUES015.
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