Sebastião Gomes dos Santos Filho
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View article: Optical properties of extended inverted pyramid arrays enhancing silicon solar cells light absorption, simulated using Comsol Multiphysics®
Optical properties of extended inverted pyramid arrays enhancing silicon solar cells light absorption, simulated using Comsol Multiphysics® Open
Surface texturization plays a pivotal role in enhancing the efficiency of silicon solar cells by optimizing light absorption. Macroporous silicon has a versatile manufacturing process, enabling the formation of closely packed pores with su…
View article: Simulation and fabrication of surface-modified glass coverslips to enhance energy harvesting on indoor MOS solar cells
Simulation and fabrication of surface-modified glass coverslips to enhance energy harvesting on indoor MOS solar cells Open
In this work, analytical and numerical simulations of the reflectance of glass coverslips with different rough-layer thickness carried out to establish the conditions of use as low reflectance intensifier plates for energy harvesting on in…
View article: Sustainability in Industry 4.0: Edge Computing Microservices as a New Approach
Sustainability in Industry 4.0: Edge Computing Microservices as a New Approach Open
The importance of the electronics sector in the modern world is unquestionable, as it demonstrates clean technology, dry processes, and efficient design, which favor Industry 4.0 and sustainability. Nonetheless, the large number of instrum…
View article: Increasing interdisciplinarity and science interest on the undergraduate students: the use of an algorithmic ignitor and low-cost sensors in cloud computing
Increasing interdisciplinarity and science interest on the undergraduate students: the use of an algorithmic ignitor and low-cost sensors in cloud computing Open
This work aimed the increase in interdisciplinarity and in engineering inclusion using algorithms during undergraduate disciplines and/or scientific initiation. Methodology follows a case study, focuses two of the largest educational insti…
View article: Influence of Chemical Cleaning Procedures and Thermal Oxidation Processes on the Uniformity of MOS Gate Oxides on Abrupt Steps on Silicon Surfaces
Influence of Chemical Cleaning Procedures and Thermal Oxidation Processes on the Uniformity of MOS Gate Oxides on Abrupt Steps on Silicon Surfaces Open
This work analyzes the influence of some chemical steps used in standard cleaning recipes on the surface micro-roughness of silicon wafers. The effect of varying the ammonium hydroxide concentration in the NH4OH: H2O2:H2O solution was stud…
View article: Structure proposed to deal with sensor-based data
Structure proposed to deal with sensor-based data Open
The possibility of greater control over processes, with the increasing use of sensors, leads to the generation of a large amount of data and, consequently, inherent difficulties, also need care. Storage, processing, filtering, become more …
View article: Structure proposed to deal with sensor-based data
Structure proposed to deal with sensor-based data Open
The possibility of greater control over processes, with the increasing use of sensors, leads to the generation of a large amount of data and, consequently, inherent difficulties, also need care. Storage, processing, filtering, become more …
View article: Fabrication and Characterization of Zeolitic Imidazolate Framework-90 (ZIF-90) Absorbers for Carbon Dioxide Sensing at Near Infrared Band
Fabrication and Characterization of Zeolitic Imidazolate Framework-90 (ZIF-90) Absorbers for Carbon Dioxide Sensing at Near Infrared Band Open
In this work, layers of crystalline zeolites formed by tetrahedrally-coordinated Zn ions bridged by imidazolate (ZIF-90) were deposited in order to investigate the desorption and absorption of CO2 and apply these layers as pre-concentrator…
View article: Physical characterization of hafnium aluminates dielectrics deposited by atomic layer deposition
Physical characterization of hafnium aluminates dielectrics deposited by atomic layer deposition Open
Hafnium aluminates films with 50 mol% of Hf were deposited onto Si(100) using atomic layer deposition. The films were annealed by RTP at 1000 oC for 60 s in pure N2 or N2+5%O2 and by LASER at 1200oC for 1ms in pure N2. Then, they were char…
View article: Electrospun Polymeric Fibers Coated With Pd As A Sensitive Layer For Hydrogen Detection
Electrospun Polymeric Fibers Coated With Pd As A Sensitive Layer For Hydrogen Detection Open
Polymeric fibers can be used in several fields of research and technology depending on the type of polymer and the diameter of the fiber used. One of the most important features inherent to fibers is the large surface area that can be expl…
View article: Characterization of Birefringent Titanium-Oxide Thin Films Deposited by DC Sputtering
Characterization of Birefringent Titanium-Oxide Thin Films Deposited by DC Sputtering Open
This work presents the characterization of birefringent properties of titanium-oxide thin films using spectrophotometry and double-cavity Fabry-Perot structures. All films were deposited by DC sputtering over tilted substrates and the bire…
View article: Flow-injection Analysis Technique Used to Electrochemically Measure Nitrite through a Gold Working Electrode Modified with 1-2 Diaminobenzene (DAB)
Flow-injection Analysis Technique Used to Electrochemically Measure Nitrite through a Gold Working Electrode Modified with 1-2 Diaminobenzene (DAB) Open
In this paper, it is presented nitrite analysis, electrochemically measured, using a Flow-injection Analysis (FIA) system. The importance of determining nitrite from water, food and blood is based on its toxicity for human health, even at …
View article: Potentiostatic Electrodeposition of Au-Sn Alloys from a Non-Cyanide Bath for Soldering: Influence of Reagents Concentrations
Potentiostatic Electrodeposition of Au-Sn Alloys from a Non-Cyanide Bath for Soldering: Influence of Reagents Concentrations Open
This work presents an extensive study of a non-cyanide Au-Sn bath to obtain potentiostatically deposited Au-Sn alloys. In addition, Au-Sn bath speciation was studied through a program for chemical equilibrium simulation (CHEAQS Pro) and th…
View article: Process Oxygen Flow Influence on the Structural Properties of Thin Films Obtained by Co-Sputtering of (TeO2)x-ZnO and Au onto Si Substrates
Process Oxygen Flow Influence on the Structural Properties of Thin Films Obtained by Co-Sputtering of (TeO2)x-ZnO and Au onto Si Substrates Open
In this study, we investigated the structural properties of TeO2-ZnO (TZ) and TeO2-ZnO-Au (TZA) thin films sputtered under different oxygen concentrations and either annealed or not annealed at 325 °C in air for 10 or 20 h. The lattice cha…
View article: Electrical Characterization of Positively Charged SiO Coatings for MOS Solar Cells
Electrical Characterization of Positively Charged SiO Coatings for MOS Solar Cells Open
This article discusses fabrication, characteriza-tion and studies of the C-V characteristics of SiO layers depos-ited by PVD on Si-p substrates with doping around 1x1016 cm-3. MOS capacitors (Metal-Oxide-Semiconductor) with Al/SiO2/Si-P, …
View article: MOS Capacitance Measurements for PEALD TiO2 Dielectric Films Grown under Different Conditions and the Impact of Al2O3 Partial-Monolayer Insertion
MOS Capacitance Measurements for PEALD TiO2 Dielectric Films Grown under Different Conditions and the Impact of Al2O3 Partial-Monolayer Insertion Open
In this paper, we report the plasma-enhanced atomic layer deposition (PEALD) of TiO2 and TiO2/Al2O3 nanolaminate films on p-Si(100) to fabricate metal-oxide-semiconductor (MOS) capacitors. In the PEALD process, we used titanium tetraisopro…
View article: ELECTROSPINNING PAN/PdCl2 NANOFIBER FOR HIDROGEN STORAGE – THE INFLUENCE OF THE PREPARATION METHOD
ELECTROSPINNING PAN/PdCl2 NANOFIBER FOR HIDROGEN STORAGE – THE INFLUENCE OF THE PREPARATION METHOD Open
The search for materials for hydrogen storage that are able to adsorb and desorb hydrogen molecules has received attention. Nanofibers have been studied because it has some interesting characteristics like high surface to volume ratio and …
View article: Combined detection of nitrite and bioelectrical activity using microelectrode arrays and a phosphate buffered saline solution
Combined detection of nitrite and bioelectrical activity using microelectrode arrays and a phosphate buffered saline solution Open
This paper presents the manufacturing of a microelectrode array, on printed circuit boards (PCB) and on silicon substrate, composed of 60 to 64 gold microelectrodes (between 4 µm and 70 µm each in diameter). The sensor has a measurement to…