Materials Literature
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Al/ScOx/NiOx/n-Si and Al/ScOx/SiOx/n-Si metal-insulator-semiconductor capacitors have been electrically characterized. Scandium oxide was grown by high pressure sputtering on different substrates to study the dielectric/insulator interface quality. The substrates were silicon nitride and native silicon oxide. The use…
Nanostructured amorphous aluminum oxide (Al2O3) thin films codoped with Erbium ions (Er3+) and Si nanoparticles (Si NPs) are prepared by pulsed laser deposition. The doping structure can be controlled in such a way that Er3+ and Si NP concentrations are optimized independently, the Si NP sizes are selected and the Er3…
InVO4 doped with Eu3+ ions had been synthesized at 950° for 6 hr in air using the sol-gel method. XRD results indicate that the crystallinity of InVO4:Eu3+ powders decreases with increasing Eu3+ ion concentrations. From the SEM images, the shapes of the InVO4 particles are uniform and like pebbles. With increasing Eu3…
Self-assembled Ge nanodots were formed by in-situ thermal annealing of a thin amorphous Ge layer deposited by molecular beam epitaxy on a thin SiO2 or TiO2 layer on Si(001). The dot photoluminescence (PL) appeared primarily as a wide near-infrared band peaked near 800 meV. Using both the k•p and tight binding theoreti…
Dwight R. Acosta, A. Guillen-Santiago, L. Castaneda, A. Maldonado and M. de la L. Olvera* Instituto de Fisica, Universidad Nacional Autonoma de Mexico, IFUNAM, Apartado Postal 20-364, Mexico, D.F., 01000, Mexico. Instituto de Fisica, Universidad Autonoma de Puebla, Apartado Postal J-48, Puebla 72570, Mexico. Departame…
The crack tip deformation and surface potential distribution on SUS316L stainless steels were observed by SKFM and KFM. The existence of hydrogen-induced martensite was examined by the magnetic force microscope (MFM) observations. The results showed that the less noble potential region existed near the crack tip. MFM…
This work presents the preliminary tests on the performance of cathodic prevention (CPre) in reinforced mortar, subjected to aggressive (10% NaCl environment). Cathodic prevention is an electrochemical technique for minimizing, actually "preventing" any eventual corrosion of the steel bars in reinforced concrete. Ther…
Extremely low reflectance was obtained from InP porous nanostructures in UV, visible, and near-infrared light ranges. The reflectance strongly depended on the surface morphology of the porous structures prepared by the electrochemical process, and the lowest reflectance of 0.1% in the visible light range was obtained…
Emission quenching of semiconductor nanocrystals by redox molecules been studied using CdTe and ZnS-AgInS2 solid solution (ZAIS) nanocrystals. The quench behavior was investigated in terms of electric charge and electron transfer reaction. Regarding CdTe nanocrystals, it was found that charges of CdTe and redox specie…
Si nanocrystals or nanoclusters (Si-nc) either intrinsic or doped (C, Er, Yb,...) and embedded in dielectrics (silicon oxide or nitride) are used as gate materials for integrated Si LEDs. This is becoming the material system of choice of silicon photonics to devise light emitters integrated with CMOS technology. MOSLE…
Anodic dissolution behaviour of titanium in ethylene glycol solution containing chloride salt was examined using a rotating disk electrode. A potential-independent dissolution current flowed depending on the rotation speed, species and concentration of chloride salts. The current controlled by the mass transfer proces…
Fluoreszierende Streifen: Koordinationspolymere aus Zink- oder Silberionen und Pyridinderivaten als Liganden wurden auf kontrollierte Weise in Mikroschablonen erhalten, die zuvor lithographisch in Kapillaren erzeugt wurden. Dabei resultieren stark fluoreszierende Polymermuster mit supramolekularer Struktur (siehe Bild…
A tetragonal ZrO2 film stabilized by incorporating Ge atoms from an underlying Ge layer through a thermal annealing was investigated as the gate dielectric for Ge MOS devices. Formation of a tetragonal ZrO2 film and admixture of Ge atoms into a ZrO2 film were respectively confirmed by x-ray diffraction (XRD) and x-ray…
The redox properties of dense pellets of Ce0.50Zr0.50O2 have been investigated by temperature programmed reduction (TPR) (1023-1373K) and mild temperature oxidation (873K) cycles, X-ray powder diffraction technique (XRD), RAMAN spectroscopy and electrochemical impedance spectroscopy (EIS) have been used to characteriz…
Carbon modified (CM)-n-TiO2 thin film was synthesized and optimized by flame oxidation method at high temperature of 825{degree sign}C, and 16 min heating time. The natural gas and oxygen flow rates of 3.32 L/min and 2.23 L/min were found optimum to incorporate the appropriate amounts of carbon concentration in the bu…
Epitaxial growth of ZnO on a tetragonal LiAlO2 (100) substrate and an orthorhombic LiGaO2 (100) substrate was examined using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Results indicated that the crystal structure plays a major role on the orientation selection. The m-plane Zn…
A formation process of the silicide/Si contact with low contact resistance in the source/drain (S/D) regions has been developed in order to reduce the S/D electrodes series resistance of MOSFETs. Er that has a low Schottky barrier height (SBH) for electrons and Pd that has a low SBH for holes were selected to n+- and…
II-VI nanowires offer a unique combination of properties for developing blue/UV optoelectronic devices. Key to realizing this potential is managing the nanowire growth process to ensure appropriate properties are realized. Taking ZnSe as an example, we report on the influence of growth conditions (namely, growth tempe…
An AC/DC spark anodizing method was used to coat the aluminum-copper (Al-Cu) alloy AA2219 with oxide films to protect them form corrosion. The effect of electrolyte solution composition and the lifetime use of the anodizing solution on the anodizing process and the oxide film properties have been investigated. In this…
An experimental technique for making electrochemical measurements on isolated individual phase regions of known crystalline orientation in a duplex stainless steel is demonstrated. An ultraviolet-sensitive photoresist is used to mask the excluded portions of the sample and a 355 nm laser exposes only portions of the f…