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Review
Physics, Applied
Yuan Qin et al.
Summary: Benefitted from progress on the large-diameter Ga2O3 wafers and processing techniques, Ga2O3 power device technology has rapidly advanced for power electronics applications. Reports on large-area Ga2O3 power devices have emerged globally, going beyond device demonstration to packaging, testing, and evaluation. Ga2O3 is the only wide bandgap semiconductor reaching these milestones for power device development. This paper provides a timely review on ampere-class Ga2O3 power devices, covering their electrical performance, switching characteristics, packaging and thermal management, and ruggedness and reliability.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
A. Fakkahi et al.
Summary: In this paper, the impact of the applied electric field and structure sizes on the shallow donor impurity binding energy, polarizability, and photoionization cross section of multilayer spherical quantum dots is investigated. The wave functions and eigenvalues of the structure are calculated using the finite-element method and the effective mass approximation. The numerical results reveal that the system sizes and external electric field greatly influence the binding energy of shallow donor impurities, polarizability, and the dependence of the photoionization cross section on incident photon energy.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Mohamed El-Yadri et al.
Summary: This study investigates the impact of quantum size and an external magnetic field on the optoelectronic properties of a cylindrical AlxGa1-xAs/GaAs-based core/shell nanowire. The Hamiltonian of an interacting electron-donor impurity system was described using the one-band effective mass model and two numerical methods were employed to calculate the ground state energies: the variational and finite element methods. The system's cylindrical symmetry revealed transcendental equations due to the finite confinement barrier between the core and the shell, leading to the concept of the threshold core radius. The results demonstrate that the optoelectronic properties strongly rely on core/shell sizes and the external magnetic field strength, with the electron's maximum probability of occurrence depending on the threshold core radius value. This threshold radius separates two regions with different physical behaviors, while the applied magnetic field acts as an additional confinement.
Article
Nanoscience & Nanotechnology
Tiancai Jiang et al.
Summary: In this study, Ga2O3@Al2O3 core-shell nanowires were synthesized for high-performance photodetectors. The nanowires exhibited high sensitivity, fast response speed, and superior specific detectivity and rejection ratio. This method provides an effective approach to design and prepare high-performance photonic devices.
ACS APPLIED NANO MATERIALS
(2023)
Review
Chemistry, Physical
Haojie Li et al.
Summary: In recent years, (AlxGa1-x)2O3 materials have been extensively studied for their potential in deep-ultraviolet optoelectronic and high-power electronic devices. These materials demonstrate high dielectric constants, breakdown electric fields, two-dimensional electron gas, and large tunable bandgap. They have been successfully used in improving power handling ability and modulating the detection wavelength of photodetectors. The research on (AlxGa1-x)2O3 growth and device applications has yielded exciting results. This article provides a comprehensive overview of their structural and electronic properties, growth methods, thermal conductivity, two-dimensional electron gas, and device applications. The challenges and opportunities for (AlxGa1-x)2O3 materials are also discussed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Chinmoy Nath Saha et al.
Summary: This study investigates the temperature dependent pulsed current voltage and RF characterization of beta-(AlxGa1-x)(2)O-3/Ga2O3 hetero-structure FETs (HFETs) before and after silicon nitride (Si3N4) passivation. The results show that Si3N4 can effectively reduce current collapse and shift the threshold voltage without degrading the RF performance, making it a potential candidate for passivation of beta-(AlxGa1-x)(2)O-3/Ga2O3 HFETs.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Hsin-Ying Lee et al.
Summary: In this study, metal oxide-based multiple quantum wells (MQWs)/n-HfO2:Ga2O3 deep ultraviolet light-emitting diodes (DUV-LEDs) were manufactured and studied. By replacing MQWs with a single i-Ga2O3 active layer, the luminance of the DUV-LEDs was improved due to the effective carrier recombination in the i-Ga2O3 well caused by the effective carrier block of the i-Al2O3:Ga2O3 barrier in the MQWs.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Physics, Condensed Matter
Ibrahim Maouhoubi et al.
Summary: This study investigates the effects of dielectric screening, temperature, and magnetic field on the diamagnetic susceptibility and binding energy of donor impurities in GaAs quantum disks (QDisks). It also reports on the influence of position, hydrostatic pressure, temperature, and magnetic field on the dielectric screening function and diamagnetic coefficient. The results show that variations in QDisk dimensions, temperature, magnetic field, and pressure significantly affect the diamagnetic susceptibility and binding energy, as well as the diamagnetic coefficient and dielectric screening.
PHYSICA B-CONDENSED MATTER
(2022)
Review
Materials Science, Multidisciplinary
Huanwei Zou et al.
Summary: This paper reviews the applications of core-shell nanostructured materials in catalysis, adsorption, sensing, membrane separation and biomedical fields. It comprehensively analyzes and discusses the representative research in each field, providing reference for relevant works, and offers a future prospective application of core-shell nanomaterials.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Hongchao Zhai et al.
Summary: Gas sensors fabricated from Ga2O3 materials have superior properties and have been commercialized for detecting oxygen and carbon monoxide. Recent studies have shown potential applications of Ga2O3-based gas sensors in detecting other gases. This article presents the recent advances, influence factors, and applications of Ga2O3-based gas sensors, as well as discussing the challenges and opportunities.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
Abdullah Bilekkaya
Summary: The hydrogenic impurity energy states in GaAs/Al-x1 Ga1-x1 As/GaAs/Alx2Ga1-x2As layers coaxial triangular cross-section quantum well wires are theoretically studied under electric and magnetic field. The binding energy variations of central hydrogenic impurity bound electrons are obtained based on barrier width and barrier heights, and the effects of magnetic and electric fields on the structures are investigated.
Article
Materials Science, Multidisciplinary
L. Belamkadem et al.
Summary: In this study, we systematically investigate the factors that influence the ground state binding energy between a hydrogen impurity and an electron in a wedge-shaped cylindrical quantum dot (WSCQD), considering an infinite confinement potential and the influence of external electric field in different directions. Using the numerical finite difference method, we solve the Schroedinger equation in three dimensions and calculate the binding energy for different quantum dot geometries, electric field directions, and impurity positions. Our findings reveal that the electric field direction plays a crucial role in the binding energy of off-center impurities, and we discuss the weak effect of the radial electric field in the critical azimuthal angle of the WSCQD. We also provide a physical interpretation for the competition between different effects on the electron-impurity distance, including the electric field direction, impurity position, and non-symmetry of the WSCQD. Furthermore, we discuss the effects of finite confinement potential and validate our calculations using the finite element method.
Review
Chemistry, Physical
Jun Zhu et al.
Summary: This paper presents a comprehensive review of major advances in the field of Ga2O3-based gas sensors over the past thirty years. It covers topics such as the polymorphs and basic electric properties of Ga2O3, typical preparation methods for Ga2O3-sensing material, and strategies to improve gas-sensing performance. The paper also provides suggestions for future development of Ga2O3-based gas sensors, including constructing hybrid structures, combining theoretical calculations and machine learning, and developing optical sensors.
Article
Multidisciplinary Sciences
M. Hbibi et al.
Summary: This study investigates the effects of confinement potentials, core size, and shell thickness on the confinement of electron, electron-donor atom, and exciton in a cylindrical core/shell/shell quantum dot (CSSQD). The findings suggest that these factors strongly influence the binding energy and energy levels of the particles, which could have implications for modifying electronic and excitonic properties in nanomaterials science.
SCIENTIFIC REPORTS
(2022)
Review
Materials Science, Multidisciplinary
Chowdam Venkata Prasad et al.
Summary: Beta-Gallium oxide (beta-Ga2O3) has emerged as a promising semiconductor material for power electronic devices due to its ultra-wide bandgap and diverse material systems. This review article discusses recent investigations on the interface engineering of beta-Ga2O3-based power devices, summarizing different methods for improving performances and addressing challenges such as p-type doping difficulty and low thermal conductivity. The study also highlights the potential of ion-cutting process for achieving full potential of beta-Ga2O3 in power electronics.
MATERIALS TODAY PHYSICS
(2022)
Review
Physics, Applied
Xiaohu Hou et al.
Summary: Research on gallium oxide for deep-ultraviolet solar-blind detection has attracted significant interest due to its unique material properties and potential applications. Various crystal phases and polymorphous Ga2O3-based solar-blind photodetectors have been studied, with a focus on enhancing performance through techniques such as doping and annealing. DUV imaging technologies based on Ga2O3 SBPDs are systematically summarized, demonstrating promising future prospects for applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Praneeth Ranga et al.
Summary: This study reports on the growth and characterization of metalorganic vapor-phase epitaxy-grown beta-(AlxGa1-x)(2)O-3/beta-Ga2O3 modulation-doped heterostructures. An electron channel is achieved in the heterostructure by utilizing a delta-doped beta-(AlxGa1-x)(2)O-3 barrier, with characteristics studied using various measurement methods. The fabricated transistor demonstrates high peak current and on-off ratio, while the electron channel in beta-(AlxGa1-x)(2)O-3 displays promising charge density and mobility at room temperature.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Condensed Matter
Lei Shi et al.
Summary: The behavior of a donor impurity confined in an elliptic cylindrical core/shell quantum dot under a non-axial electric field is influenced by various factors such as core and shell sizes, ellipticity, electric field direction, and impurity position. The binding energy and photoionization cross section in different conditions show significant variations due to the shape of the core/shell quantum dot.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Review
Materials Science, Multidisciplinary
Damanpreet Kaur et al.
Summary: The article discusses the application of gallium oxide-based photodetectors in UV-C radiation sterilization. Despite existing challenges, the paper emphasizes key parameters and future prospects for development in this field.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Physics, Condensed Matter
Tigran K. Ghukasyan et al.
SUPERLATTICES AND MICROSTRUCTURES
(2020)
Article
Physics, Applied
Joseph E. Lyman et al.
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Weiyang Wang et al.
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
M. Kneiss et al.
Article
Physics, Applied
S. H. Ha et al.
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
S. H. Ha et al.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2020)
Article
Chemistry, Inorganic & Nuclear
M. Solaimani
SOLID STATE SCIENCES
(2020)
Article
Physics, Condensed Matter
K. El-Bakkari et al.
SUPERLATTICES AND MICROSTRUCTURES
(2020)
Article
Physics, Applied
I. Janet Sherly et al.
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Condensed Matter
Alfonso A. Portacio et al.
SUPERLATTICES AND MICROSTRUCTURES
(2018)
