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Dispensing technology was tested to be used for obtaining aluminum contacts for silicon solar cells. Two different aluminum pastes were used and the specific contact resistance was compared for both of them. The FTC method was tested as well by the using of this technology. Optical microscope pictures were taken to see the obtained structures and the scanning electron microscopy was used to check...
The effective mobility-lifetime product, a figure of merit for charge carrier transport in a photovoltaic device, was determined for small-molecule bulk heterojunction organic solar cells by means of a simplified methodology comprising variable light intensity measurements. The recombination losses within the intrinsic active layer, accounted by a recombination current that reduces the generated photocurrent,...
A photonic crystal based on a macroporous silicon structure has been fabricated and successfully used for the detection of carbon dioxide. In this paper, the device and the measurement results are presented. The sensing device here described uses an optical approach to the detection of the gas. The use of a photonic crystal allows creating a compact device working in the medium infrared spectral range...
We have deposited intrinsic amorphous silicon (a-Si:H) using the ECR-CVD (Electron Cyclotron Resonance Chemical Vapor Deposition) technique, and we have analyzed the interface between a-Si:H and crystalline silicon (c-Si). In order to obtain the a-Si:H/c-Si density of interface defects (Dit), we have followed the conductance method proposed by E. H. Nicollian and A. Goetzberger, normally applied to...
Mars MetNet Mission is a collaborative project involving research groups of Finland, Russia and Spain, with the aim of providing a network of several tens of atmospheric stations along the Martian surface. MEIGA-MetNet payload is the Spanish contribution to this mission, where an extensive atmospheric science payload onboard a lander with restricting mass and power budgets (45 g and 1 W in the previous...
In this paper, a microfluidic Lab on Chip (LOC) platform for clinical diagnosis of glucose is proposed. The method is based on measuring the amount of glucose in a sample using a colorimetric enzyme-kinetic method. The colorimetric changes are detecting using an absorbance system consisting of a light emitting diode and a phototransistor working on the wave length of 505 nm. The proposed platform...
In this paper we analyze the effects of X-ray irradiation on a-Si:H TFTs. We have irradiated at low doses, up to 1 krad, and we have measured several transistors, obtaining coherent behaviors. The main effect is a shifting of the threshold voltage, as well as a change in the Ioff current and a change in the mobility. We discuss these effects, and find them to be around three orders of magnitude higher...
We introduce the design and fabrication of a microoptical system of reduced dimensions, based on hybrid integration of commercial components (i.e. VCSELs and microlenses) through silicon micromachining. We demonstrate the feasibility of integrating these components with the aim of providing up to 4 collimated or focused laser beams. The application for this system will be the detection of microparticles...
In this work, the influence of the underlying substrate on the mobility and electronic transport in graphene is evaluated by means of an ensemble Monte Carlo simulator. The substrates considered are h-BN, SiC, SiO2 and HfO2. The substrate type strongly affects the low-field mobility, particularly at room temperature; however, at low temperature the differences between supported graphene and suspended...
Blistering of 11 nm and 45 nm-thick Al2O3 layers deposited by ALD on silicon substrates is studied in Al-Al2O3-Si structures fabricated using a field isolated process. Blisters are shown to be unevenly distributed and with different dimensions depending on the structure area. After chemical etching down to silicon, round voids are revealed underneath the blisters depending on the etchant used, indicating...
Internet of Things and Trillion Sensors are buzzwords illustrating the path towards the next grand paradigm: Smart Everywhere. In many of those realizations long term autonomy of sensor systems is a must to tackle different societal challenges and innovation scenarios. Microenergy autonomy solutions based on energy harvesting offer a promising way in which silicon technology and silicon friendly materials...
A comparative study of Radiation-sensitive field effect transistors (RADFETs) response to photon and electron beams has been carried out in reference conditions. Both types of beams, which are routinely used in clinical radiotherapy, have been applied to RADFETs of several gate oxide thicknesses, sizes and technological processes manufactured by Tyndall National Institute, Cork, Ireland. They show...
This paper presents a comparative study of four planar capacitive sensors with different geometrical layouts. These sensors have been fabricated by inkjet printing on a flexible substrate whose electrical permittivity is dependent on relative humidity. We have used numerical simulations to design each of these structures. In particular, we present the calibration curves of interdigitated electrodes,...
A hand held wireless portable electronic nose (e-nose) has been developed for general purpose applications. It is based on non-specific micromechanized semiconductor sensors. It has been applied to the real time detection of two common aromatic defects in beer: acetaldehyde and ethyl acetate. Several measurements are made in order to check the discrimination capability of the system in the quantitative...
This paper reports a novel application of a portable and wireless sensor system (e-nose) to differentiate, through recognition and detection of different white grape variety types, different winemaking techniques. The system is also tested to differentiate the different grape varieties in each winemaking technique combination. The analysis has been done with principal component analysis and artificial...
The present work implements solvers with OpenCL of the FGMRES and preconditioned BCGSTAB algorithms. These solvers are integrated in a 3-D simulation tool of nanoscaled MOSFET transistors. Simulations are launched in two different platform devices: NVIDIA Tesla S2050 and Intel Xeon Phi 3120A. The resulting times of execution are compared against the optimized PSPARSLIB version of the FGMRES solver...
In this work, we investigate and explain the time-dependent behavior of shot noise in Silicon quantum dot-based double-tunnel junctions by means of a three-dimensional self-consistent simulation and a Monte-Carlo algorithm following the time evolution of the system. We demonstrate the strong link between autocorrelation functions and electron waiting time distributions, i.e, the time between two consecutive...
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