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We review the Monte Carlo method to model semi-classical carrier transport in advanced semiconductor devices. We report examples of the use of the Multi-Subband Monte Carlo method to simulate MOSFETs with III–V compound semiconductor channel. Monte Carlo transport modeling of graphene-based transistors is also addressed.
Surface enhanced Raman spectroscopy is an important technique for detection of wide number of analytes. Today, there is a growing need for the development of stable, sensitive, reproducible and portable SERS-active substrates for use in different fields. Some of the most extensively used SERS substrates are metal colloids. However, the use of the colloid solutions for SERS deals with important issues,...
Transition-metal chalcogenides are prospective thermoelectric materials. One of them is a molybdenum disulfide MoS2, which has a layered structure. MoS2 has a good potential to have a high value of thermoelectric quality factor due to a high value of thermo-EMF and low value of thermal conductivity. But a low value of its electrical conductivity suppresses the thermoelectric quality factor ZT on the...
The work presents a study of piezoresistive effect of thin films of rhenium-doped molybdenum disulfide of composition Mo0.95Re0.05S2 possessing layered structure of 2H-MoS2 type. The compound was synthesized by high temperature ampoule method using stoichiometric mixture of elements. The thin films were formed by spraying colloidal dispersion produced by liquid exfoliation of solid phase in mixed...
In this paper, we studied the influence of the parameters of technologically relevant dielectrics (SiO2, Al2O3 and HfO2) and channel thickness downscaling on the electron mobility in InGaAs-on-insulator channels with (100) surface orientation. The study of mobility properties is enabled by a self-consistent Schrödinger-Poisson solver that is coupled with a scattering simulator based on the momentum...
Emitter length scaling of HCBT with single polysilicon region is investigated by 3D device simulations with the emphasis on the high frequency characteristics. It is shown that collector current and junction capacitances have linear dependence on the emitter length. Collector resistance can be represented by two components which appear in parallel, one that scales proportionally with the emitter length...
In this paper, the effect of the floating guard ring (FGR) parameters, such as number of FGRs and the distances between the FGRs, on the prevention of the breakdown at the multiplication layer edge for a given avalanche photodiode (APD) structure has been analyzed. Four structures are examined: APD without FGR and APDs with one, two and three FGRs. The width and depth of the boron-doped FGRs is 1...
This paper presents the design of a high-voltage differential amplifier using six different pre-input stage circuits to reduce high-voltage input levels to low-voltage signals. The proposed circuits are designed using 65 nm CMOS process technology with a nominal voltage of 2.5 V and a supply voltage of 5 V. The designs are based on stacked low-voltage standard CMOS transistors. The different pre-input...
A low power tag with integrated ADC designed in 0.18-µm CMOS process is presented. The tag extracts energy from electromagnetic waves and stores the charge on external capacitor. The stored charge is used to supply the tag circuitry: supply unit, current and voltage references and voltage regulators and ADC. The obtained referent voltage shows good stability over process, voltage and temperature variations...
In today's market significant segment is taken by the applications using sensors to track physical events in the surrounding environment. Market raise is particularly related to the distributed sensor networks based on the wireless communications (like Internet of Things IoT devices). One of the hardest challenges in this field is associated with the power supply requirements. Battery operated electronics...
We investigate the influence of temperature on multimode Fabry-Pérot laser output in a proposed colorless WDM system with self-seeding via modulation averaging reflector and with BLS-seeding. In particular, we investigate the connection between the information about the optical laser output from the laser integrated monitor photodetector and optical power output of the entire system with temperature...
We demonstrate a fiber-optic sensor for monitoring mechanical vibrations in high-power electric machines built using 3D-printing. We describe the design, mechanical and optical modeling, and the results of its preliminary characterization. The measurements show linear sensor response in the frequency range 10 to 150 Hz.
This paper compares the electromagnetic and electrical properties of a planar inductor used in a low-profile organic light-emitting diode (OLED) driver. A luminary consists of the OLED cell and its driver which uses a planar inductor. The proximity of the OLED cell and the constrained area makes the planar inductor lossy. The planar inductor represents a loop antenna and a main source of radiated...
The electromagnetic compatibility (EMC) performance of the voltage regulators is the significant factor in the EMC performance of the complete electronic system. In this paper the characterization of the voltage regulator by direct power injection (DPI) method is presented. Although, the DPI method is defined by various standards, the repeatability of the measurement can be compromised by several...
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