Communication—Electron-Beam Stimulated Release of Dislocations from Pinning Sites in GaN

To achieve low leakage in GaN-based power devices and improve reliability in optoelectronic devices such as laser diodes, it is necessary to reduce dislocation density in epitaxial layers and control their introduction during processing. We have previously shown that dislocations can be introduced at room temperature in GaN. The effect of electron-beam irradiation at fixed points on the shift of such freshly introduced dislocations in GaN is reported. Dislocations can be displaced up to 10-15 µm from the beam position. We conclude the main reason limiting the dislocation travelling distance is the existence of a high number of pinning sites.

Nano/Micro and Bio-Inspired Materials on Wide-Bandgap-Semiconductor-Based Optoelectronic/Power Devices

This Special Issue on “Nano/Micro and Bio-Inspired Materials on Wide-Bandgap-Semiconductor-Based Optoelectronic/Power Devices” is a collection of 20 original articles dedicated to theoretical and experimental research works providing new insights and practical findings in the field of solid-state technology-related topics [...]

Active thermal interface graphene nanocomposites for thermal control of electronic and power devices

New experimental and calculated data are presented for active thermal interface materials, in which heat is removed not only due to high thermal conductivity, but also due to the evaporation of liquids, for example, water, inside a nanoporous graphene structure. It is shown that such active thermal interfaces may be new systems of active thermal control.

Wet Etching in β-Ga2O3 Bulk Single Crystal

Beta-phase gallium oxide (β-Ga2O3) bulk single crystal has received increasing attentions due to their fantastic performances and widespread use in power devices and solar-blind photodetectors. Wet etching has proved to...

Control and understanding of metal contacts to β-Ga2O3 single crystals: a review

Gallium oxide (Ga2O3) is a promising semiconductor for high power devices and solar blind ultraviolet photodetectors due to its large bandgap, a high breakdown field, and high thermal stability. Recently, a considerable achievement has been obtained for the growth of high-quality β-Ga2O3 and high performance β-Ga2O3 based devices. However, rapid advance in device performance can be limited by the critical issues of metal contacts to β-Ga2O3 such as barrier height, leakage current, ohmic contact, and surface, interfacial and deep states. This article aims to provide a review on the recent studies in the control and understanding of metal contacts to β-Ga2O3, particularly in terms of the barrier formation. This review suggests that understanding the current transport mechanisms of metal contacts to β-Ga2O3 more thoroughly is necessary to enhance the performance, stability and reliability of β-Ga2O3 based devices.

Gesture-Based Human Machine Interaction Using RCNNs in Limited Computation Power Devices

The use of gestures is one of the main forms of human machine interaction (HMI) in many fields, from advanced robotics industrial setups, to multimedia devices at home. Almost every gesture detection system uses computer vision as the fundamental technology, with the already well-known problems of image processing: changes in lighting conditions, partial occlusions, variations in color, among others. To solve all these potential issues, deep learning techniques have been proven to be very effective. This research proposes a hand gesture recognition system based on convolutional neural networks and color images that is robust against environmental variations, has a real time performance in embedded systems, and solves the principal problems presented in the previous paragraph. A new CNN network has been specifically designed with a small architecture in terms of number of layers and total number of neurons to be used in computationally limited devices. The obtained results achieve a percentage of success of 96.92% on average, a better score than those obtained by previous algorithms discussed in the state of the art.

Performance of IUPQC for Multi-Feeder Systems using Particle Swarm Optimization (PSO) and Multilevel-Inverter with Grid Integration of Hybrid Renewable Energy System

An ordinary PID system and an anti PID saturation technique are used to confirm the dominance of the proposed approach in a wind structure with exchange work. 6. The simulation is performed in MATLAB to designate the predominance of the anticipated calculation. The replica mould is shown in the image. Figure 9 depicts the controller surface waveforms in relation to the planned computation, where the level directions are instance t and the upward arrangements in are input esteem. In the end, the proposed method is capable of deciphering a symphonic disguise. There is a 0.9993-second lag between the factor power and 1, which means the factor power is very close to 1. New power-electronic devices, dubbed "Specific Power Devices," are being developed to reduce power quality problems and provide customers with tailored solutions. Modern s0lutions f0r l0adrelated issues and supply v0ltage flaws are included in UPQC, which stands for Unified Power Quality Conditioners. Shunt Compensation and Series Compensation work together to solve many power quality issues. The series compensator's current and voltage profiles are improved thanks to the shunt compensator. Custom feeding systems have emerged as a result of the assumption that a healthy feeder next to it can compensate for issues in the current feeding unit. With these devices, you'll get better performance than with a unique power supply for each feeder. These unique power devices include the IDVR, IVOLCON, and IUPQC with two voltage stabilisation capacitors, as well as the Interline Dynamic Voltage Restored (IDVR). The use of a new IUPQC topology that concurrently compensates for voltage and current impurities while also improving Power Quality Quality. In typical approaches, f0ur v0ltage source c0nverters (VSC) with multi-tier topologies are taken into account, and a hexagonal coordinate system space vect0r pulse width m0dulation is employed. The PI controller improves power quality while reducing status errors. Because of these drawbacks, the PI controller isn't the best choice for high-reliability applications. Particle Swarm Optimization uses the PI controller installation to further increase power quality (PSO). The IUPQC with Particle Swarm Optimization (PSO) stabilises voltage and current discrepancies for improved power quality in the multibus/multi-feeder system. In order to compensate for voltage changes, a proposed controller utilises a shared capacitor to distribute voltage from healthy feeds to neighbouring feeders. Tw0 feeders with a hybrid renewable energy system implement the researchers' technique. MATLAB/SIMLUNIK was used to analyse IUPQC's results. Keywords: Grid Integrati0n, Multi-Feeder Systems, Multi-Level C0nverters, P0wer Quality Impr0vement, Renewable Energy Systems

Step-graded AlGaN vs superlattice: Role of strain relief layer in dynamic on-resistance degradation

In this work, we study the impacts of different types of strain relief layer (SRL) on dynamic on-resistance (Ron) degradation of GaN power devices on Si by back-gate ramping and vertical leakage measurement. Our study reveals that the SRL has important effects on the dynamic Ron. Compared with step-graded AlGaN SRL, the superlattice SRL possesses much more energy barriers, which can more effectively block the leakage of holes from GaN buffer and the injection of electrons from Si substrate. Enhancing the carrier blocking ability of SRL could contribute to the suppression of dynamic Ron degradation.

Ferroelectric Materials Based Coupled Nanogenerators

Innovations in nanogenerator technology foster pervading self-power devices for human use, environmental surveillance, energy transfiguration, intelligent energy storage systems, and wireless networks. Energy harvesting from ubiquitous ambient mechanical, thermal, and solar energies by nanogenerators is the hotspot of the modern electronics research era. Ferroelectric materials, which show spontaneous polarization, are reversible when exposed to the external electric field, and are responsive to external stimuli of strain, heat, and light are promising for modeling nanogenerators. This review demonstrates ferroelectric material-based nanogenerators, practicing the discrete and coupled pyroelectric, piezoelectric, triboelectric, and ferroelectric photovoltaic effects. Their working mechanisms and way of optimizing their performances, exercising the conjunction of effects in a standalone device, and multi-effects coupled nanogenerators are greatly versatile and reliable and encourage resolution in the energy crisis. Additionally, the expectancy of productive lines of future ensuing and propitious application domains are listed.