Física Aplicada: Enviaments recents
Ara mostrant els elements 41-60 de 555
On the determination of the interface density of states in a-Si:H/a-SiC:H multilayers
This paper deals with the determination of the interface density of states in amorphous silicon-based multilayers. Photothermal deflection spectroscopy is used to characterize two series of aSi:H/aSi1-xCx:H multilayers, ...
The role of hydrogen in the formation of microcrystalline silicon
The growth mechanisms of microcrystalline silicon thin films at low temperatures (100-250°C) by plasma CVD are still a matter of debate. We have shown that ue-Si:H formation proceeds through four phases (incubation, ...
C-Band Dual-Doppler Retrievals in Complex Terrain: Improving the Knowledge of Severe Storm Dynamics in Catalonia
Convective activity in Catalonia (northeastern Spain) mainly occurs during summer and autumn, with severe weather occurring 33 days per year on average. In some cases, the storms have unexpected propagation characteristics, ...
Production of nanometric particles in radio frequency glow discharges in mixtures of silane and methane
The formation of silicon particles in rf glow discharges has attracted attention due to their effect as a contaminant during film deposition or etching. However, silicon and silicon alloy powders produced by plasma¿enhanced ...
Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition
The scope of this work is the systematic study of the silicidation process affecting tungsten filaments at high temperature (1900ºC) used for silane decomposition in the hot-wire chemical vapour deposition technique (HWCVD). ...
Low temperature amorphous and nanocrystalline silicon thin film transistors deposited by Hot-Wire CVD on glass substrate
Amorphous and nanocrystalline silicon films obtained by Hot-Wire Chemical Vapor Deposition have been incorporated as active layers in n-type coplanar top gate thin film transistors deposited on glass substrates covered ...
Hot wire configuration for depositing device grade nano-crystalline silicon at high deposition rate
The University of Barcelona is developing a pilot-scale hot wire chemical vapor deposition (HW-CVD) set up for the deposition of nano-crystalline silicon (nc-Si:H) on 10 cm × 10 cm glass substrate at high deposition rate. ...
Electromagnetic phenomena induced by weak gravitational fields. Foundations for a possible gravitational wave detector
In the context of the weak-field approximation to the De Rham wave-vector equation, and applying the standard Lorentz gauge to both electromagnetism and gravitation, a linearized expression for the De Rham operator is ...
Hot wire chemical vapor deposition: limits and opportunities of protecting the tungsten catalyzer from silicide with a cavity
Hot Wire Chemical Vapor Deposition (HW-CVD) is one of the most promising techniques for depositing the intrinsic microcrystalline silicon layer for the production of micro-morph solar cells. However, the silicide formation ...
Growth and functionalization of carbon nanotubes on quartz filter for environmental applications
Background: Air pollution has become an important issue worldwide due to its adverse health effects. Among the different air contaminants, volatile organic compounds (VOCs) are liquids or solids with a high vapor pressure ...
Magneto-optical Kerr effect in laser-patterned La2/3Sr1/3MnO3 epitaxial thin films
In this study, we have performed magneto-optical Kerr effect (MOKE) measurement on epitaxial La2/3Sr1/3MnO3 thin films containing artificial interfaces created by laser-patterning the SrTiO3 substrate. The observed increase ...
Structural and high-pressure properties of rheniite (ReS2) and (Re,Mo)S2
Rhenium disulfide (ReS2), known in nature as the mineral rheniite, is a very interesting compound owing to its remarkable fundamental properties and great potential to develop novel device applications. Here we perform ...
Light scattering by coupled oriented dipoles: decomposition of the scattering matrix
We study the optical response of two coupled oriented dipoles with the dimer axis perpendicular to the wave vector of light by analyzing how their scattering matrix can be decomposed. The scattering matrix can be written ...
Analysis of two heat wave driven ozone episodes in Barcelona and surrounding region: meteorological and photochemical modeling
During the summer of 2019 unusual exceedances of ozone concentration affected NE Spain. A detailed study of two heat wave driven ozone episodes is presented based on the high resolution forecast air quality ARAMIS system, ...
Is an NWP-Based Nowcasting System Suitable for Aviation Operations?
The growth of air transport demand expected over the next decades, along with the increasing frequency and intensity of extreme weather events, such as heavy rainfalls and severe storms due to climate change, will pose a ...
Acousto-optic systems for advanced microscopy
Acoustic waves in an optical medium cause rapid periodic changes in the refraction index, leading to diffraction effects. Such acoustically controlled diffraction can be used to modulate, deflect, and focus light at ...
Ellipsometric study of a-Si:H thin films deposited by square wave modulated rf glow discharge
Thin films of hydrogenated amorphous silicon (a‐Si:H), deposited by square wave modulated (SQWM) rf silane discharges, have been studied through spectroscopic and real time phase modulated ellipsometry. The SQMW films ...
Is temperature reducing the transmission of COVID-19?
The first confirmed case of SARS-CoV-2 in the city of Barcelona, Spain, was identified on February 25th, 2020. Since then, the epidemic spread countrywide, and Spain has become the second most affected country worldwide ...
Influence of Co-Sputtered Ag:Al Ultra-Thin Layers in Transparent V2O5/Ag:Al/AZO Hole-Selective Electrodes for Silicon Solar Cells
As optoelectronic devices continue to improve, control over film thickness has become crucial, especially in applications that require ultra-thin films. A variety of undesired effects may arise depending on the specific ...
Chiral symmetry breaking induced by energy dissipation
Spontaneous chiral symmetry breaking is observed in a wide variety of systems on very different scales, from the subatomic to the cosmological. Despite its generality and importance for a large number of applications, its ...
