ABSTRACT With the introduction of HBTs based on InGaP the device reliability could be dramatically improved. Life tests at junction temperatures of 225degreesC showed no significant device degradation after 1000 hours of test time. In... more
ABSTRACT With the introduction of HBTs based on InGaP the device reliability could be dramatically improved. Life tests at junction temperatures of 225degreesC showed no significant device degradation after 1000 hours of test time. In order to obtain significant device degradation within reasonable test times, the applied stress must be increased in a responsible manner in order not to introduce artificial ageing effects. In this paper, life test results on In-GaP HBTs are presented and discussed for junction temperatures attaining 340degreesC.
Research Interests:
A study with scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) of the Al–1wt.%Si–0.5wt.%Cu bond pad metallisation with Al–1wt.%Si wires bonded to it revealed Cu diffusion from the bond pad into the Al... more
A study with scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) of the Al–1wt.%Si–0.5wt.%Cu bond pad metallisation with Al–1wt.%Si wires bonded to it revealed Cu diffusion from the bond pad into the Al wire after an annealing process. Investigation at different annealing times showed a Cu depletion zone which indicates that the radius R is consistent with a
Research Interests:
An alternative energy source that has appeared beyond expectations and has seen a lot of progress is the fuel cell. A proton exchange membrane (PEM) fuel cell is chosen for analysis and requires a DC-DC boost converter as an interface... more
An alternative energy source that has appeared beyond expectations and has seen a lot of progress is the fuel cell. A proton exchange membrane (PEM) fuel cell is chosen for analysis and requires a DC-DC boost converter as an interface between the fuel cell and the load to provide a high-gain regulated voltage. Although great effort towards developing different converter topologies has been made during recent decades, less attention has been devoted to the reliability and thermal performance assessment of the present converters. In this paper, five non-isolated DC-DC converters are analyzed in terms of both thermal behavior and reliability. The temperature estimation of semiconductor devices as a critical part of the thermal analysis has been made via a detailed thermal model and the reliability is evaluated by means of a power cycling test. Finally, a performance score has been attributed using the TOPSIS ranking methodology and considering all the criteria (e.g., the number of comp...
Research Interests:
This paper examines the practical challenges of simplified setups aimed at achieving high-power IGBTs’ IC–VCE curve. The slope of this I–V curve (which is defined as on-resistance RCE) and the point where the VCE–VGE curve visibly bends... more
This paper examines the practical challenges of simplified setups aimed at achieving high-power IGBTs’ IC–VCE curve. The slope of this I–V curve (which is defined as on-resistance RCE) and the point where the VCE–VGE curve visibly bends (threshold gate voltage) can be suitable failure precursor parameters to determine an IGBT’s health condition. A simplified/affordable design for these specific measurements can be used for in-situ condition monitoring or field testing of switching devices. First, the possible I–V curve measurement methods are discussed in detail in order to prevent self-heating. The selected design includes two IGBTs in which the high-side IGBT was the device under test (DUT) with a constant gate voltage (VGE) of 15 V. Then, the low-side IGBT was switched by a short pulse (50 μs) to impose a high-current pulse on the DUT. The VCE–VGE curve was also extracted as an important failure-precursor indicator. In the next stage, a power-cycling test was performed, and the i...
Research Interests:
Research Interests:
Serotonin is an important neurotransmitter that plays a major role in the pathogenesis of a variety of conditions, including psychiatric disorders. The detection of serotonin typically relies on high-performance liquid chromatography... more
Serotonin is an important neurotransmitter that plays a major role in the pathogenesis of a variety of conditions, including psychiatric disorders. The detection of serotonin typically relies on high-performance liquid chromatography (HPLC), an expensive technique that requires sophisticated equipment and trained personnel, and is not suitable for point-of-care applications. In this contribution, we introduce a novel sensor platform that can measure spiked neurotransmitter concentrations in whole blood samples in a fast and low-cost manner by combining synthetic receptors with a thermal readout technique-the heat-transfer method. In addition, the design of a miniaturized version of the sensing platform is presented that aims to bridge the gap between measurements in a laboratory setting and point-of-care measurements. This fully automated and integrated, user-friendly design features a capillary pumping unit that is compatible with point-of-care sampling techniques such as a blood l...
Research Interests:
Research Interests: Chemical Engineering, Materials Science, Molecular Biology, Biotechnology, Cancer, and 15 moreProtein, Nanotechnology, Medicine, Aptamers, Biosensor, Glycoproteins, Peanut Butter, Cancer cells, HTM, Detection Limits, PLANT PROTEINS, Aptamer, Biosensing Techniques, Biomimetic Sensors, and Food matrix
Research Interests:
Research Interests: Materials Engineering, Condensed Matter Physics, Materials Science, Chemistry, Spectroscopy, and 8 moreSecondary Ion Mass Spectrometry, Scanning Electron Microscopy, Impedance Spectroscopy, Optoelectronics, Dielectric Spectroscopy, Scanning Electron Microscope, Electroluminescence, and Indium tin oxide
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Computer Science, Materials Science, Analytical Chemistry, Biomimetics, Molecular Imprinting, and 14 moreThermography, Medicine, Sensors, Polymer, Transducers, Thermal Conductivity, Microarray Analysis, Molecular weight, Energy Transfer, Equipment Design, Equipment Failure Analysis, Electrical And Electronic Engineering, Organic Chemicals, and Microfluidic Analytical Techniques
ABSTRACTRecently, the concept of creating a boron doped nanocrystalline diamond (B-NCD) based temperature regulator for bio-sensing applications was proven. In this work, the next step is taken, i.e. one device working simultaneously as... more
ABSTRACTRecently, the concept of creating a boron doped nanocrystalline diamond (B-NCD) based temperature regulator for bio-sensing applications was proven. In this work, the next step is taken, i.e. one device working simultaneously as thermistor and heater. In combination with a PID-control., it is possible to create a temperature control, with possible set points going from room temperature till 70°C, with an accuracy exceeding a maximum temperature variation of 0.2 °C. Parallel with steering the temperature by varying the current through the B-NCD film, its resistance is measured with a 4-point measurement from which the temperature can be derived using a calibration curve. This value is the feedback for the PID-control to steer the current used for the regulation.
Research Interests:
Research Interests:
Research Interests: Molecular Biology, Biology, Nanomedicine, Nanotechnology, Medicine, and 15 moreDNA, Humans, Mutation, Mutations, Mutation Detection, Gene, Base Sequence, Label free, Genetic Markers, Exon, Nanocrystalline Diamond, Melting Temperature, Molecular Sequence Data, DNA mutational analysis, and Pharmacology and pharmaceutical sciences
Research Interests: Engineering, Materials Science, Biomedical Engineering, Photonics, Confocal Microscopy, and 15 moreMedicine, DNA, Biomedical Optics, Quality Factor, Deoxyribonucleic Acid, Biosensor, Light, Sapphire, Optical physics, Optometry and Ophthalmology, Optics and Photonics, Aluminum oxide, Microspheres, Microcavity, and Whispering Gallery Modes
Research Interests: Computer Science, Materials Science, Analytical Chemistry, Biomimetics, Molecular Imprinting, and 15 moreNanotechnology, Electrochemical Sensors, Medicine, Histamine, Antibodies, Sensors, Artifacts, Pid Controller, Receptors, Immunoassay, Microchemistry, Equipment Design, Equipment Failure Analysis, Electrical And Electronic Engineering, and Molecularly Imprinted Polymers
Research Interests:
Research Interests:
Research Interests: Materials Engineering, Condensed Matter Physics, Materials Science, Chemistry, Microscopy, and 15 moreMembranes, Heat Transfer, Separation, Nanotechnology, Phase Transitions, DNA, Lipid Membranes, Differential scanning calorimetry, Quartz crystal microbalance, Dissipation, Diamond, Mixtures, Sensitivity, Calorimetry, and Parameters
Research Interests:
Research Interests:
... [5] JH Burroughes, DDC Bradley, AR Brown, RN Marks, K. MacKay, RH Friend, PL Burns, AB Holmes, Nature 347 (1990) 539. [6] NC Greenham, SC Moratti, DDC Bradley, RH Friend, AB Holmes, Nature 365 (1993) 628. ... [ll] M. Van Der Borght,... more
... [5] JH Burroughes, DDC Bradley, AR Brown, RN Marks, K. MacKay, RH Friend, PL Burns, AB Holmes, Nature 347 (1990) 539. [6] NC Greenham, SC Moratti, DDC Bradley, RH Friend, AB Holmes, Nature 365 (1993) 628. ... [ll] M. Van Der Borght, D. Vanderzande, J. Gelan, Synth. ...
Research Interests:
The presence of oxygen in the surrounding atmosphere exerts an important influence on the electro-optical characteristics and the degradation behaviour of organic electroluminescent Al-PPV-ITO-diodes. Experiments in various gas... more
The presence of oxygen in the surrounding atmosphere exerts an important influence on the electro-optical characteristics and the degradation behaviour of organic electroluminescent Al-PPV-ITO-diodes. Experiments in various gas atmospheres show that the devices ...
Research Interests:
Research Interests: Engineering, Chemistry, Hybridization, Single Nucleotide Polymorphisms (SNPs), Lab On A Chip, and 14 moreConfocal Microscopy, Medicine, Impedance Spectroscopy, DNA, Sensors, Dielectric Spectroscopy, Nucleic acid hybridization, Mutation Detection, CHEMICAL SCIENCES, Surfaces, Electrophoresis, Sodium Hydroxide, DNA probes, and Transition Temperature
Research Interests:
Research Interests: Engineering, Materials Science, Chemistry, Molecular Imprinting, Polymers, and 15 moreMedicine, Impedance Spectroscopy, Biological Sciences, Serotonin, Histamine, Humans, Nicotine, Dielectric Spectroscopy, Urine, CHEMICAL SCIENCES, Saliva, Analytical and Bioanalytical Chemistry, Biological Assay, Biosensing Techniques, and Molecular Structure
Research Interests:
Research Interests:
A new impedance spectroscopy unit is developed, fully customized to become a vital part of label free biosensor arrays with possible applications in DNA and protein sensing. Test measurements are conducted to explore the accuracy and... more
A new impedance spectroscopy unit is developed, fully customized to become a vital part of label free biosensor arrays with possible applications in DNA and protein sensing. Test measurements are conducted to explore the accuracy and specificity of the system, both under electronic lab conditions as well as under wet cell conditions with synthetic-diamond based sensor electrodes. The impedance of seven resistors was monitored for 17 h and a maximum error <0.02% was found. Furthermore, the impedance of PBS at different concentrations was monitored for 60 min per concentration and a different impedance for each concentration was detected. The impedance is also monitored for NaOH, PBS and nuclease free water at different temperatures with a total duration of 60 min per fluid. Systematically different impedances for each temperature per fluid were found and the temperature coefficients were determined. All test measurements lead to results well within specification.
Research Interests:
Polymer light-emitting diodes (PLEDs) made with poly(p-phenylene vinylene) (PPV) using a non-ionic precursor route with indium—tin oxide (ITO) as anode and Al as cathode have been examined during continuous electrical stress in an... more
Polymer light-emitting diodes (PLEDs) made with poly(p-phenylene vinylene) (PPV) using a non-ionic precursor route with indium—tin oxide (ITO) as anode and Al as cathode have been examined during continuous electrical stress in an oxygen-rich atmosphere. Three distinct regions in the time evolution of the equivalent electrical resistance and the light output of PLEDs are identified. Various electrical and analytical measurement
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
During the first thermal treatment after deposition and/or passivation of Al-based interconnects, a marked decrease in the electrical resistance can be observed. This resistance decrease cannot be described in terms of a single rate... more
During the first thermal treatment after deposition and/or passivation of Al-based interconnects, a marked decrease in the electrical resistance can be observed. This resistance decrease cannot be described in terms of a single rate constant. Precipitation of the alloyed elements is probably the responsible atomic process. In a previous article, a spectrum of activation energies was extracted in order to characterize this decay. Recent research has shown that the presence of an activation energy spectrum is, mathematically, completely equivalent with a spectrum of pre-exponential factors. Since for precipitation–dissolution, the pre-exponential factor is a function of the distribution and geometry of the precipitates, the use of a spectrum of pre-exponential factors is for this specific case probably physically more relevant. The technique introduced for the determination of the spectrum of activation energies is still valid in case of the presence of a spectrum of pre-exponential factors.
Research Interests:
There are several reasons to believe that the microstructural changes in Al-Si interconnects has to be described in terms of a spectrum of activation energies rather than in terms of a single activation energy. In this article, a method... more
There are several reasons to believe that the microstructural changes in Al-Si interconnects has to be described in terms of a spectrum of activation energies rather than in terms of a single activation energy. In this article, a method is presented to extract a spectrum of activation energies from an isothermal and a constant heating rate experiment. The formalism was applied to the relaxation behavior of passivated Al-1&percnt;Si interconnects. The method of analysis shows that the microstructural relaxation mechanisms in these interconnects are characterized by a narrow spectrum, centered at an energy of about 1.2 eV.