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AlGaN/GaN-HEMT power amplifiers with optimized power-added efficiency for X-band applications

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Book Series: Karlsruher Forschungsberichte aus dem Institut für Hochfrequenztechnik und Elektronik ISSN: 18684696 ISBN: 9783866446151 Year: Volume: 62 Pages: XI, 230 p. DOI: 10.5445/KSP/1000021579 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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This work has arisen out of the strong demand for a superior power-added efficiency (PAE) of AlGaN/GaN high electron mobility transistor (HEMT) high-power amplifiers (HPAs) that are part of any advanced wireless multifunctional RF-system with limited prime energy. Different concepts and approaches on device and design level for PAE improvements are analyzed, e.g. structural and layout changes of the GaN transistor and advanced circuit design techniques for PAE improvements of GaN HEMT HPAs.

Wide Bandgap Semiconductor Based Micro/Nano Devices

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ISBN: 9783038978428 9783038978435 Year: Pages: 138 DOI: 10.3390/books978-3-03897-843-5 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering --- Electrical and Nuclear Engineering
Added to DOAB on : 2019-08-28 11:21:27
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While group IV or III-V based device technologies have reached their technical limitations (e.g., limited detection wavelength range or low power handling capability), wide bandgap (WBG) semiconductors which have band-gaps greater than 3 eV have gained significant attention in recent years as a key semiconductor material in high-performance optoelectronic and electronic devices. These WBG semiconductors have two definitive advantages for optoelectronic and electronic applications due to their large bandgap energy. WBG energy is suitable to absorb or emit ultraviolet (UV) light in optoelectronic devices. It also provides a higher electric breakdown field, which allows electronic devices to possess higher breakdown voltages. This Special Issue seeks research papers, short communications, and review articles that focus on novel synthesis, processing, designs, fabrication, and modeling of various WBG semiconductor power electronics and optoelectronic devices.

Keywords

optical band gap --- tungsten trioxide film --- annealing temperature --- electrochromism --- AlGaN/GaN HEMT --- DIBL effect --- channel length modulation --- power amplifier --- W band --- high electron mobility transistors --- high electron mobility transistor (HEMT) --- AlGaN/GaN --- ohmic contact --- regrown contact --- ammonothermal GaN --- power amplifier --- I–V kink effect --- AlGaN/GaN HEMT --- large signal performance --- 4H-SiC --- MESFET --- ultrahigh upper gate height --- power added efficiency --- harsh environment --- space application --- 1T DRAM --- wide-bandgap semiconductor --- high-temperature operation --- TCAD --- amorphous InGaZnO (a-IGZO) --- thin-film transistor (TFT) --- positive gate bias stress (PGBS) --- passivation layer --- characteristic length --- edge termination --- silicon carbide (SiC) --- junction termination extension (JTE) --- breakdown voltage (BV) --- Ku-band --- GaN high electron mobility transistor (HEMT) --- power amplifier --- asymmetric power combining --- amplitude balance --- phase balance --- micron-sized patterned sapphire substrate --- growth of GaN --- sidewall GaN --- flip-chip light-emitting diodes --- distributed Bragg reflector --- light output power --- external quantum efficiency --- threshold voltage (Vth) stability --- gallium nitride (GaN) --- high electron mobility transistors (HEMTs) --- analytical model --- high-temperature operation --- T-anode --- GaN --- buffer layer --- anode field plate (AFP) --- cathode field plate (CFP) --- n/a

MEMS/NEMS Sensors: Fabrication and Application

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ISBN: 9783039216345 9783039216352 Year: Pages: 242 DOI: 10.3390/books978-3-03921-635-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-12-09 16:10:12
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Due to the ever-expanding applications of micro/nano-electromechanical systems (NEMS/MEMS) as sensors and actuators, interest in their development has rapidly expanded over the past decade. Encompassing various excitation and readout schemes, the MEMS/NEMS devices transduce physical parameter changes, such as temperature, mass or stress, caused by changes in desired measurands, to electrical signals that can be further processed. Some common examples of NEMS/MEMS sensors include pressure sensors, accelerometers, magnetic field sensors, microphones, radiation sensors, and particulate matter sensors. Despite a long history of development, fabrication of novel MEMS/NEMS devices still poses unique challenges due to their requirement for a suspended geometry; and many new fabrication techniques have been proposed to overcome these challenges. However, further development of these techniques is still necessary, as newer materials such as compound semiconductors, and 2-dimensional materials are finding their way in various MEMS/NEMS applications, with more complex structures and potentially smaller dimensions.

Keywords

thermoelectric power sensor --- wideband --- GaAs MMIC --- MEMS --- floating slug --- back cavity --- microwave measurement --- MEMS --- high temperature pressure sensors --- AlGaN/GaN circular HFETs --- GaN diaphragm --- adaptive control --- backstepping approach --- tracking performance --- microgyroscope --- resonant frequency --- resistance parameter --- micro fluidic --- oil detection --- MEMS --- microactuator --- magnetic --- micro-NIR spectrometer --- scanning grating mirror --- deflection position detector --- dual-mass MEMS gyroscope --- frequency tuning --- frequency split --- quadrature modulation signal --- frequency mismatch --- suspended micro hotplate --- single-layer SiO2 --- temperature uniformity --- power consumption --- infrared image --- MEMS (micro-electro-mechanical system) --- inertial switch --- acceleration switch --- threshold accuracy --- squeeze-film damping --- photonic crystal cavity --- photonic crystal nanobeam cavity --- optical sensor --- refractive index sensor --- nanoparticle sensor --- optomechanical sensor --- temperature sensor --- Accelerometer readout --- low noise --- low zero-g offset --- microfluidic --- femtosecond laser --- rapid fabrication --- glass welding --- bonding strength --- accelerometer design --- spring design --- analytical model --- gas sensor --- micropellistor --- microdroplet --- pulse inertia force --- methane --- tetramethylammonium hydroxide (TMAH) --- wet etching --- silicon --- 3D simulation --- level-set method --- single crystal silicon --- anisotropy --- vibrating ring gyroscope --- frequency split --- accelerometer --- tunnel magnetoresistive effect --- electrostatic force feedback --- n/a

Synthesis and Modification of Nanostructured Thin Films

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ISBN: 9783039284542 9783039284559 Year: Pages: 276 DOI: 10.3390/books978-3-03928-455-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-04-07 23:07:09
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The Special Issue “Synthesis and Modification of Nanostructured Thin Films” highlights the recent progress in thin film synthesis/modification and characterization. New methods are reviewed for the synthesis and/or modification of thin films based on laser, magnetron, chemical, and other techniques. The obtained thin nanostructures are characterized by complex and complementary techniques. We think that most of proposed methods can be directly applied in production, but some others still need further elaboration for long-term prospective applications in lasers, optics, materials, electronics, informatics, telecommunications, biology, medicine, and probably many other domains. The Guest Editor and the MDPI staff are therefore pleased to offer this Special Issue to interested readers, including graduate and PhD students as well as postdoctoral researchers, but also to the entire community interested in the field of nanomaterials. We share the conviction that this can serve as a useful tool for updating the literature, but also to aid in the conception of new production and/or research programs. There is plenty of room for further dedicated R&D advances based on new instruments and materials under development.

Keywords

AlGaN --- nanopatterned sapphire substrate --- hydride vapor phase epitaxy --- stress --- transmission electron microscopy --- copper nanowires --- CuNWs --- degradation --- encapsulation --- PDMS --- PMMA --- solution-based --- transparent electrode --- photonic crystal fiber --- demultiplexer --- dense wavelength division multiplexing --- lithium niobate --- waveguide --- photonic integrated circuit --- propagation loss --- optical lithography --- chemo-mechanical polishing --- gold thin film --- nonlinear absorption --- nonlinear refraction --- transient absorption --- nanoparticles --- high-order harmonics --- electroluminescence --- nanolaminate --- Al2O3 --- Tm2O3 --- atomic layer deposition --- germanium --- DLC --- doped biomaterials --- pulsed laser deposition --- reactive oxygen species --- apoptosis --- cytotoxicity --- titanium film --- interlayer --- cohesion --- residual stress --- nano-indenter --- nanocrystal --- CdTe --- Cu-doped --- ZnTe --- solar cells --- solution processed --- pulsed laser deposition --- chalcogenide thin films --- Raman spectroscopy --- spectroscopic ellipsometry --- noble metal nanoparticles --- pulsed laser ablation --- surface enhanced Raman spectroscopy --- antiepileptic drugs --- Zn2+ substituted Coll-CaPs biomimetic layers --- MAPLE --- spin coating --- dye-sensitized solar cells --- photovoltaic conversion efficiency --- TiO2 thin films --- pulsed laser deposition --- DLC bio-functionality --- silicon doping --- diffusion barrier --- biocompatibility --- proliferation improvement --- endothelial cells --- ZnO nanofilms --- SHG --- Ga doping --- polarization angle --- Cu2MgxZn1?xSnS4 --- thin films --- photoelectric performance --- sol–gel --- sulfuration treatment --- solar cell --- nanomaterial --- zinc oxide --- barium titanate --- composite --- ethylene vinyl acetate --- elastic modulus --- toughness --- flexural rigidity --- radiopacity --- piezoelectricity --- laser surface texturing --- laser-induced periodic surface structures --- LIPSS --- silicon --- PTFE --- friction --- n/a

Optoelectronic Nanodevices

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ISBN: 9783039286966 / 9783039286973 Year: Pages: 338 DOI: 10.3390/books978-3-03928-697-3 Language: eng
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2020-06-09 16:38:57
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During the last decade, novel graphene related materials (GRMs), perovskites, as well as metal oxides and other metal nanostructures have received the interest of the scientific community. Due to their extraordinary physical, optical, thermal, and electrical properties, which are correlated with their 2D ultrathin atomic layer structure, large interlayer distance, ease of functionalization, and bandgap tunability, these nanomaterials have been applied in the development or the improvement of innovative optoelectronic applications, as well as the expansion of theoretical studies and simulations in the fast-growing fields of energy (photovoltaics, energy storage, fuel cells, hydrogen storage, catalysis, etc.), electronics, photonics, spintronics, and sensing devices. The continuous nanostructure-based applications development has provided the ability to significantly improve existing products and to explore the design of materials and devices with novel functionalities. This book demonstrates some of the most recent trends and advances in the interdisciplinary field of optoelectronics. Most articles focus on light emitting diodes (LEDs) and solar cells (SCs), including organic, inorganic, and hybrid configurations, whereas the rest address photodetectors, transistors, and other well-known dynamic optoelectronic devices. In this context, this exceptional collection of articles is directed at a broad scientific audience of chemists, materials scientists, physicists, and engineers, with the goals of highlighting the potential of innovative optoelectronic applications incorporating nanostructures and inspiring their realization.

Keywords

localized surface plasmon --- green LED --- cathodoluminescence --- FDTD --- NiCo2S4 nanotubes --- Ti porous film --- quantum dot --- solar cells --- counter electrode --- metasurfaces --- orthogonal polarization --- high-efficiency --- polarization analyzer --- green LEDs --- InGaN/GaN superlattice --- V-pits --- external quantum efficiency --- PeLEDs --- OAB --- perovskite --- quantum confinement effect --- transparent electrode --- Ag film --- nucleation layer --- organic solar cell --- graphene oxide --- oxidation --- photodetector --- light-emitting diodes --- quantum dots --- stability --- color-conversion efficiency --- photoluminescence --- p-type InGaN --- graded indium composition --- hole injection --- quantum efficiency --- green LED --- 2D perovskite --- controllable synthesis --- flexible substrate --- photodetector --- photoelectric performance --- photodetector --- organic --- photomultiplication --- tunneling --- external quantum efficiency --- liquid crystals --- metasurfaces --- plasmonics --- actively tunable nanodevices --- solvent --- compact --- smooth --- perovskite solar cells --- indium nanoparticles (In NPs) --- textured silicon solar cells --- antireflective coating (ARC) --- plasmonic forward scattering --- InN/p-GaN heterojunction --- interface --- photovoltaics --- GaN --- LED --- nano-grating --- metamaterials --- mid infrared --- graphene split-ring --- gold split-ring --- electromagnetically induced transparency effect --- transparent conductive electrode --- Ga2O3 --- AlGaN-based ultraviolet light-emitting diode --- transmittance --- sheet resistance --- electrowetting --- tunable absorbers --- subwavelength metal grating --- plasmon resonance --- field emission --- graphene --- reduced graphene oxide --- polymer composites --- graphene ink --- cold cathode --- Fowler–Nordheim --- CdTe microdots --- Schottky barrier --- photodetector --- piezo-phototronic effect --- UV LEDs --- double-layer ITO --- pinhole pattern --- current spreading --- light output power --- flip-chip mini-LED --- prism-structured sidewall --- waveguide photons --- light extraction --- erbium --- silicon transistor --- photocurrent --- colorimetry --- excitation wavelength --- light-emitting diode --- quantum dots --- ternary organic solar cells --- graphene ink --- functionalization --- air-processed --- cascade effect --- charge transfer --- n/a

Nanoelectronic Materials, Devices and Modeling

Authors: ---
ISBN: 9783039212255 9783039212262 Year: Pages: 242 DOI: 10.3390/books978-3-03921-226-2 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Technology (General) --- General and Civil Engineering
Added to DOAB on : 2019-08-28 11:21:27
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As CMOS scaling is approaching the fundamental physical limits, a wide range of new nanoelectronic materials and devices have been proposed and explored to extend and/or replace the current electronic devices and circuits so as to maintain progress with respect to speed and integration density. The major limitations, including low carrier mobility, degraded subthreshold slope, and heat dissipation, have become more challenging to address as the size of silicon-based metal oxide semiconductor field effect transistors (MOSFETs) has decreased to nanometers, while device integration density has increased. This book aims to present technical approaches that address the need for new nanoelectronic materials and devices. The focus is on new concepts and knowledge in nanoscience and nanotechnology for applications in logic, memory, sensors, photonics, and renewable energy. This research on nanoelectronic materials and devices will be instructive in finding solutions to address the challenges of current electronics in switching speed, power consumption, and heat dissipation and will be of great interest to academic society and the industry.

Keywords

UAV --- vision localization --- hierarchical --- landing --- information integration --- memristor --- synaptic device --- spike-timing-dependent plasticity --- neuromorphic computation --- memristive device --- ZnO films --- conditioned reflex --- quantum dot --- sample grating --- cross-gain modulation --- bistability --- distributed Bragg --- semiconductor optical amplifier --- topological insulator --- field-effect transistor --- nanostructure synthesis --- optoelectronic devices --- topological magnetoelectric effect --- drain-induced barrier lowering (DIBL) --- gate-induced drain leakage (GIDL) --- silicon on insulator (SOI) --- graphene --- supercapacitor --- energy storage --- ionic liquid --- UV irradiation --- luminescent centres --- bismuth ions --- two-photon process --- oscillatory neural networks --- pattern recognition --- higher order synchronization --- thermal coupling --- vanadium dioxide --- band-to-band tunneling --- L-shaped tunnel field-effect-transistor --- double-gate tunnel field-effect-transistor --- corner-effect --- AlGaN/GaN --- high-electron mobility transistor (HEMTs) --- p-GaN --- enhancement-mode --- 2DEG density --- InAlN/GaN heterostructure --- polarization effect --- quantum mechanical --- gallium nitride --- MISHEMT --- dielectric layer --- interface traps --- current collapse --- PECVD --- gate-induced drain leakage (GIDL) --- drain-induced barrier lowering (DIBL) --- recessed channel array transistor (RCAT) --- on-current (Ion) --- off-current (Ioff) --- subthreshold slope (SS) --- threshold voltage (VTH) --- saddle FinFET (S-FinFET) --- potential drop width (PDW) --- shallow trench isolation (STI) --- source/drain (S/D) --- conductivity --- 2D material --- Green’s function --- reflection transmision method --- variational form --- dual-switching transistor --- third harmonic tuning --- low voltage --- high efficiency --- CMOS power amplifier IC --- insulator–metal transition (IMT) --- charge injection --- Mott transition --- conductive atomic force microscopy (cAFM) --- gate field effect --- atomic layer deposition (ALD) --- zinc oxide --- silicon --- ZnO/Si --- electron affinity --- bandgap tuning --- conduction band offset --- heterojunction --- solar cells --- PC1D --- vertical field-effect transistor (VFET) --- back current blocking layer (BCBL) --- gallium nitride (GaN) --- normally off power devices --- n/a

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