Enginyeria Electrònica i Biomèdica: Recent submissions
Now showing items 501-520 of 787
Recombination dynamics in ZnO nanowires: Surfaces states versus mode quality factor
In this work, we investigate the influence of finite size on the recombinations dynamics of ZnO nanowires. We demonstrate that diameter as well as lenght of nanowires determine the lifetime of the neutral donor bound ...
Efficiency and reliability enhancement of silicon nanocrystal field-effect luminescence from nitride-oxide gate stacks
We report on a field-effect light emitting device based on silicon nanocrystals in silicon oxide deposited by plasma-enhanced chemical vapor deposition. The device shows high power efficiency and long lifetime. The power ...
3D-Printed Broadband Power Divider Based on Helical-Microstrip Transmission Line Segments
Received May 17, 2022, accepted June 3, 2022, date of publication June 13, 2022, date of current version June 20, 2022. Digital Object Identifier 10.1109/ACCESS.2022.3182707 3D-Printed Broadband Power Divider Based ...
Strain, alloy composition, and lattice relaxation measured by optical-absorption spectroscopy
The validity of optical absorption (OA) as a technique for the measurement of strain e11, alloy composition x, and relaxation in InxGa1−xAs epilayers on InP has been examined by comparison with similar measurements by ...
Fluorescence Multi-Detection Device Using a Lensless Matrix Addressable microLED Array
A Point-of-Care system for molecular diagnosis (PoC-MD) is described, combining GaN and CMOS chips. The device is a micro-system for fluorescence measurements, capable of analyzing both intensity and lifetime. It consists ...
Nanostructure ITO and get more of it. Better performance at lower cost
In this paper, we investigated how different growth conditions (i.e., temperature, growth time, and composition) allows for trading off cost (i.e., In content) and performance of nanostructured indium tin oxide (ITO) for ...
Influence of porosity on the critical currents of trifluoroacetate-MOD YBa2Cu3O7 films
The influence of porosity on the superconducting properties have been investigated on YBa/sub 2/Cu/sub 3/O/sub 7/ thin films deposited on LaAlO/sub 3/ [100] substrates by the so-called Trifluoroacetate (TFA) route. Micro-Raman ...
Transport properties across the La2/3Ca1/3MnO3/SrTiO3 heterointerface
The transport properties across La2/3Ca1/3MnO3/SrTiO3 (LCMO/STO) heterostructures with different thicknesses of the STO insulating barrier have been studied by using atomic force microscopy measurements in the current ...
Shot noise in linear macroscopic resistors
We report on direct experimental evidence of shot noise in a linear macroscopic resistor. The origin of the shot noise comes from the fluctuation of the total number of charge carriers inside the resistor associated with ...
The effects of electron-hole separation on the photoconductivity of individual metal oxide nanowires
The responses of individual ZnO nanowires to UV light demonstrate that the persistent photoconductivity (PPC) state is directly related to the electron¿hole separation near the surface. Our results demonstrate that the ...
Coronal voids and their magnetic nature
Context. Extreme ultraviolet (EUV) observations of the quiet solar atmosphere reveal extended regions of weak emission compared to the ambient quiescent corona. The magnetic nature of these coronal features is not well ...
Optical visualization of ultrathin mica flakes on semitransparent gold substrates
We show that optical visualization of ultrathin mica flakes on metallic substrates is viable using semitransparent gold as substrates. This enables to easily localize mica flakes and rapidly estimate their thickness directly ...
Polarization strategies to improve the emission of a Si-based light source emitting at 1.55 um
We present a electroluminescence (EL) study of the Si-rich silicon oxide (SRSO) LEDs with and without Er3+ ions under different polarization schemes: direct current (DC) and pulsed voltage (PV). The power efficiency of the ...
Fast measurements with MOX sensors: A least-squares approach to blind deconvolution
Metal oxide (MOX) sensors are widely used for chemical sensing due to their low cost, miniaturization, low power consumption and durability. Yet, getting instantaneous measurements of fluctuating gas concentration in ...
Design, manufacture and characterization of compact filter assemblies for radiofrequency applications
This paper presents the use of additive manufacturing in the design and fabrication of a non-planar fully 3Dprinted low-pass filter. The process implements stereolithographic 3D printing and copper electroplating to produce ...
Untangling electrostatic and strain effects on the polarization of ferroelectric superlattices
The polarization of ferroelectric superlattices is determined by both electrical boundary conditions at the ferroelectric/paraelectric interfaces and lattice strain. The combined influence of both factors offers new ...
Nonlinear inverse dynamic models of gas sensing systems based on chemical sensor arrays for quantitative measurements
Gas sensing systems based on low-cost chemical sensor arrays are gaining interest for the analysis of multicomponent gas mixtures. These sensors show different problems, e.g., nonlinearities and slow time-response, which ...
ChipScope Symposium: Novel Approaches for a Chip-Sized Optical Microscope
In the Chipscope project funded by the EU, a completely new strategy towards optical microscopy is explored by a team of researchers from different European institutions. In this workshop, the different researchers of the ...
NH3 sensing with self-assembled ZnO-nanowire μHP sensors in isothermal and temperature-pulsed mode
Dielectrophoretic alignment is found to be a simple and efficient method to deposit the solution prepared ZnO nanowires onto micro hot plate substrates. Due to the strong surface effects, positive temperature coefficient ...
Electroluminiscence and optical amplification in silicon nanostructures: towards the integration of electronics and photonics
This line of research of my group intends to establish a Silicon technological platform in the field of photonics allowing the development of a wide set of applications. Particularly, what is still lacking in Silicon ...
