Stability of the platinum electrode during high temperature annealing

The modifications of the structure, electrical resistivity and surface morphology of platinum thin films on Pt/Ti/Si and Pt/TiO2/boron-phosphor-silicate glass/Si structures resulted from high-temperature annealing in the presence of oxygen were studied. It was established that regardless of the sublayers used while annealing caused platinum to recrystallize and texturize in the direction [111], and the texture is suppressed in the directions [200] and [220]. The annealing caused the drop of the volume resistivity of thin films from 0.2 to ca. 0.15 μOhm×m, and practically shown no dependence on the film thickness in case it exceeded 200 nm. As a result of recrystallization Pt films became unsmooth at low annealing temperatures and as the temperature increased hillocks were formed on the film surface. Relaxation of the compressive stress in the Pt film, facilitating the reduction of its free energy and modification of the lattice parameter towards the equilibrium value, is known to be the major hillock formation mechanism. The level of intrinsic stress in the film and the annealing temperature both determine the initial hillock formation. The final hillock height, density, and size are related to the Pt layer thickness, sublayer structure, and to the annealing time and temperature. Optimization of the sublayer structure and annealing modes makes it possible to increase the annealing temperature to ca. 780°С without causing any substantial damages to Pt microrelief. That enables us to use these structures as the bottom electrode in ferroelectric memory cells

Рhase composition and structure of multilayer nanosized metal-carbon coatings

Методами КР спектроскопии и атомно-силовой микроскопии определено влияние подслоев различной природы на фазовый состав и морфологию однокомпонентных и композиционных углеродных покрытий. Показано, что при осаждении легированного титаном углеродного покрытия на подслое титана образуются более дисперсные Сsp 2 кластеры. При этом легированные углеродные покрытия характеризуются меньшими шероховатостью и размером зерна.The influence of sublayers of various nature on the phase composition and morphology of one-component and composite carbon coatings is determined by the methods of Raman spectroscopyand atomic force microscopy. It is shown that when depositing titanium-doped carbon coating on a titanium sublayer, more dispersed Csp 2 clusters are formed. At the same time, doped carbon coatings are characterized by lower roughness and grain size