Articles tagged with Band Gap
Researchers at Rice University developed a custom Python-based software tool to rapidly analyze data from high-resolution X-ray diffraction, identifying dislocations and irregularities in the atomic lattice. The approach can accelerate the development of more reliable electronic and quantum devices.
A new approach to guiding spin waves around sharp corners has been developed, resulting in a significant boost in signal strength. The innovation uses a two-dimensional magnonic crystal with a copper film perforated with holes, creating a 'complete magnonic bandgap' that reflects spin waves.
A team of researchers from OIST and Stanford University has demonstrated a powerful new alternative approach to Floquet engineering by showing that excitons can produce Floquet effects more efficiently than light. This breakthrough enables the creation of novel quantum devices and materials with significantly lower intensities.
Researchers at Rice University have developed a new method to generate radio wave patterns that can identify signal direction with unprecedented accuracy, enabling rapid establishment of wireless links. This breakthrough enables high data-rate links to form almost as soon as the signal is sent.
Researchers at DGIST successfully developed thin-film solar cells with a narrow band gap that can operate at low temperatures and achieve high efficiencies on transparent substrates. The technology enables the production of bifacial solar cells that can generate power from both front and back sides, increasing overall efficiency.
Researchers at NC State University have developed a new technique to tune the optical properties of quantum dots using light, reducing energy consumption and environmental impact. This method allows for precise control over the bandgap, enabling the creation of high-quality perovskite quantum dots for optoelectronic devices.
Researchers from Pohang University of Science & Technology confirm the existence of hidden transport pathways in graphene, which enables faster and more efficient data handling. The study sheds light on the 'Valley Hall Effect' and its role in nonlocal resistance, providing crucial insights for advancing valleytronics device design.
A team of researchers at the Indian Institute of Science (IISc) has developed a machine learning-based approach to predict material properties using limited data. By leveraging transfer learning and multi-property pre-training, they were able to improve model performance and extend its applicability to new materials.
A new technique has been demonstrated for self-assembling electronic devices, enabling faster and less expensive production. The method uses a directed metal-ligand reaction to create semiconductor materials with tunable properties.
Researchers at the University of Minnesota have created a new, transparent conducting oxide material with increased band gap, enabling faster and more efficient devices. This breakthrough supports the development of high-performance electronics for computers, smartphones, and potentially quantum computing.
The development creates thin-film solar cells with high light absorption efficiency, transforming the interaction between light and matter. This breakthrough has potential applications in thermoelectric clothing, onboard vehicle charging, and photo-sensing technologies.
The Department of Energy awarded nearly $1 million to researchers at the University of Arkansas to develop a prototype for high-voltage power modules that can handle higher voltages and temperatures. The goal is to create smaller, more efficient, and more reliable fast-charging stations for electric vehicles.
A team of GIST researchers developed a new defect passivation strategy for polycrystalline perovskites, leading to improved power conversion efficiency and long-term operational stability. The strategy uses a chemically identical polytype of perovskite to suppress defects in the crystal structure.
The study predicts light transmission, absorption, and power generation of different PV materials, enabling the selection of optimal materials for agrivoltaics. By carefully tuning the 'colour' of light transmitted through semi-transparent PVs, researchers can enhance crop growth while generating solar power.
Researchers developed a novel clustering technique that considers both basic characteristics and target material properties, enabling the categorization of over 1,000 oxides into material groups. This approach uses machine learning to predict target properties and incorporates basic feature information into the analysis.
A new atomically-thin material has been discovered that can switch between an insulating and conducting state by controlling the number of electrons. This property makes it a promising candidate for use in electronic devices such as transistors.
Researchers developed Au-BiFeO3 nanocrystals with improved photocatalytic activity, achieving 98% methylene blue degradation efficiency. The nanoparticles' unique localized surface plasmon resonance and electron transfer mechanisms enhance their recyclability and stability.
A new defect-ordered layered halide perovskite was discovered, shedding light on how order can emerge through defects in hybrid organic–inorganic compounds. The compound's optical bandgap increased with the concentration of ordered defects in the lattice, presenting a new strategy for tuning perovskite properties.
A team of researchers has precisely measured exciton binding energies in organic semiconductors, finding unexpected correlations between the energy and material type. The study's high precision will help discuss the exciton nature of organic semiconductors with greater confidence.
Researchers at UNIST have achieved a significant breakthrough in organic semiconductor synthesis by synthesizing a novel molecule called BNBN anthracene. This derivative exhibits unique properties, including precise modulation of electronic properties without structural changes.
The university will use its expertise to create better wide bandgap semiconductors for the US defense, with potential applications in electric vehicles, power grids, and quantum technologies. The hub aims to build 'lab to fab' capability for semiconductors and enhance fundamental research.
The new resonators exhibit a record low UV light loss, enabling the development of miniaturized devices for applications such as spectroscopic sensing, underwater communication, and quantum information processing. The researchers achieved this by combining optimized design and fabrication techniques with amorphous alumina materials.
Researchers have observed the decay of two neutron-rich isotopes, oxygen-28 and oxygen-27, providing new insights into nuclear structure. The study's findings suggest that these isotopes do not exhibit a closed shell structure, challenging current theories and offering opportunities for further investigation.
Gallium oxide-based flash memory device demonstrates high performance and stability in extreme temperatures and radiation, retaining data for over 80 minutes. The team aims to improve device properties through further material quality and design advancements.
Researchers at Tokyo Institute of Technology have developed a novel ferroelectric semiconductor memory device with a 100 nm channel length, enabling high-density storage and seamless integration with existing semiconductor technologies. The device exhibits typical resistive switching, high on/off ratio, large memory window, and good re...
Researchers synthesized a new orthorhombic Sn3O4 polymorph with a narrower bandgap, indicating higher efficiency for visible light absorption. The discovery is significant for photocatalytic reactions such as water splitting and CO2 reduction.
Researchers have successfully developed chemically stable, tunable-bandgap 2D nanosheets from perovskite oxynitrides, opening new possibilities for sustainable technologies such as photocatalysis, electrocatalysts, and electronics. The nanosheets exhibit superior proton conductivity and excellent photocatalytic activity.
Researchers at City University of Hong Kong have developed a lead-free perovskite photocatalyst for highly efficient solar energy-to-hydrogen conversion. The study uncovers the interfacial dynamics between halide perovskite molecules and electrolytes, enabling better photoelectrochemical hydrogen generation.
Scientists have created a novel approach to produce phase-pure quasi-2D Ruddlesden–Popper perovskites, enabling highly efficient and spectrally stable deep-blue-emissive perovskite LEDs. The rapid crystallization method yields high-performance devices with an emission wavelength centered at 437 nm.
Researchers developed a method to improve power conversion efficiency and stability of pure iodide and mixed-halide perovskites by using two alkylammonium halide modulators. This approach substantially reduces drops in power-conversion efficiency and retains about 80-90% of initial efficiencies after continuous operation.
Researchers develop low-cost and eco-friendly method for high efficiency CIGSSe solar cells, achieving power conversion efficiency larger than 17%, by using aqueous spray deposition in air environment.
Physicists have observed novel quantum effects in a topological insulator at room temperature, opening up new possibilities for efficient quantum technologies. This breakthrough uses bismuth-based topological materials to bypass the need for ultra-low temperatures.
Researchers at the University of Tsukuba have created light-induced topological states in zinc arsenide, exhibiting unusual behavior where electrical currents flow along the surface. This work explores the possibility of creating topological semimetals and manifesting new physical properties by light control.
Scientists at KAUST have successfully created a semiconductor material with multiple exciton generation, resulting in a photocurrent quantum efficiency of over 100%. This breakthrough could lead to improved solar cells and light-harvesting applications.
Researchers found that buckyballs on gold do not exhibit unique Dirac cone behavior as previously thought, contrary to previous study suggestions. Instead, the electrons behave in a parabolic relationship between momentum and energy.
Researchers developed topological membrane metadevices for on-chip terahertz wave manipulations, showcasing robust single-mode manipulation and valley-locked edge states. This breakthrough enables the development of a robust platform for terahertz on-chip communication, sensing, and multiplexing systems.
The study achieved an efficiency of nearly 25 percent, surpassing previous values, by combining perovskites with CIS. The hybrid material enables the production of light and flexible tandem solar cells suitable for various applications.
A KAUST-led team developed organic semiconductor-based photocatalysts to store solar energy as clean hydrogen fuel. These catalysts can absorb visible light and generate long-lived charges, improving efficiency for hydrogen evolution.
Ritsumeikan University researchers create a novel thin-film flexible piezoelectric-photovoltaic device that can generate electricity from indoor lighting. The device's performance is improved through strain-induced polarization in the ZnMgO layer, increasing open-circuit voltage and overcoming charge recombination issues.
Researchers developed a hot-carrier multijunction solar cell that maintains high conversion efficiency with nonoptimal materials, expanding the scope of candidate designs. The novel architecture showed superior resilience to design imperfections, widening the range of suitable materials and operating conditions.
By pairing two waveguides, one with an ill-defined topology and another with a well-defined one, researchers created a topological singularity that can halt waves in their tracks. This phenomenon has potential applications in energy harvesting and enhancing nonlinear effects.
Researchers have successfully synthesized a new type of carbon allotrope called holey graphyne, which has semiconductor properties and can be used in various applications. The material was created using a bottom-up approach and consists of alternately linked benzene rings and C≡C bonds.
A new method for creating key components of solar cells, X-ray detectors, and LEDs uses water to control the growth of phase-pure perovskite crystals. This approach allows for precise tuning of crystal structures at room temperature.
Scientists at KAUST have studied charge carrier behavior in perovskite thin films using laser pulses and terahertz radiation. They found that increased density of charge carriers narrows the energy gap for electrons to be excited by light, and charge carriers become more localized at higher densities.
Researchers are taking stock of advancements in ultrawide bandgap (UWBG) photodetectors with deep UV capabilities, highlighting their efficiency and potential for solar-blind applications. Further work is needed to optimize device performance, particularly in assembling materials over large area substrates.
Researchers propose a novel pathway to realizing hot carrier solar cells, which can exceed the typical efficiency limit on solar cells. The approach involves isolating hot carriers within higher energy valleys in semiconductors, reducing energy loss to heat.
Researchers create a quantum anomalous Hall insulator by stacking a ferromagnetic material between two 2D topological insulators, enabling room-temperature lossless transport. The new architecture could lead to ultra-low energy future electronics or topological photovoltaics.
Researchers have confirmed a novel quantum topological material for ultra-low energy electronics, reducing energy consumption by a factor of four. The study reveals the potential of zigzag-Xene-nanoribbons to make topological transistors with robust edge states and low threshold voltage.
Researchers have created and detected dispersing excitons in a metal using angle-resolved photoemission spectroscopy, a breakthrough that could enable efficient data transmission. The discovery of mobile excitons in TaSe3 reveals their mobility and potential to revolutionize electronics.
Researchers demonstrate a two-terminal tandem solar cell with enhanced efficiency through spectrum splitting, achieving a 5-6% gain in absolute efficiency. The design uses planar and Lambertian spectral splitters to effectively distribute sunlight among the top and bottom cells.
The study reveals that manipulating the transition dipole moment of excitons in quantum dots can suppress Auger recombination. By combining with external structures, researchers achieved a new way to control the nonradiative process, potentially leading to improved efficiency of QD-based devices.
The University of Texas at El Paso has received a $917,000 grant from the Air Force Office of Scientific Research to develop advanced materials for national defense, power electronics, and security. UTEP students will perform cutting-edge research on gallium oxide-based semiconductors.
A University of Wollongong team has combined two doping elements to achieve new efficiencies in the topological insulator Bi2Se3. The resulting crystals show clear ferromagnetic ordering, a large band gap, high electronic mobility, and the opening of a surface state gap.
MnBi2Te4's unique properties make it suitable for ultra-low-energy electronics and observing exotic topological phenomena. The material is metallic along its one-dimensional edges while electrically insulating in its interior.
A study from KAUST found that interface and bandgap engineering can significantly slow down the relaxation of 'hot' electrons in semiconductors, increasing their lifetimes. This innovation has potential applications in solar cells, which could improve efficiency by reducing heat loss.
Researchers have developed a machine learning program that accurately predicts the band gap of photovoltaics materials in milliseconds, using freely available software. This breakthrough could render supercomputers unnecessary for some applications, as stoichiometry is found to be a crucial factor in predicting band gaps.
Researchers at TU Dresden and TU Munich developed a novel method to engineer the energy gap in organic semiconductors by blending materials with varying molecular shapes. This approach enables continuous tunability of the energy gap, paving the way for efficient optoelectronic devices.
Researchers in China developed new NIR dyes based on the energy gap law, achieving efficient near-infrared phosphorescence without metals. The dyes demonstrated moderate to high performance, with TBPB@PVA films showing the best results.
Scientists successfully create and manipulate quinary charge states in a single atomic defect of a 2D intermetallic semiconductor. This breakthrough enables the development of more compact solotronics devices with low energy requirements, overcoming the challenge of Coulomb repulsion energy.
Researchers at Tokyo Institute of Technology and Kyushu University have successfully synthesized a new semiconductor material that can absorb visible light, reducing its band gap from 4eV to 2eV. The material has potential applications in solar cells, photocatalysis, and pigments.