Articles tagged with Excitons
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Researchers develop a strategy to improve the photovoltaic performance of quasi-bilayer organic solar cells by dispersing donor components into the acceptor-dominant phase, achieving a champion PCE of 15.4%. The incorporation of donors improves charge transport balance and suppresses bimolecular recombination.
Scientists demonstrate efficient separation of valley exciton emission of a WS2 monolayer using two-dimensional all-dielectric PhC slabs without in-plane inversion symmetry. The delocalized Bloch modes play a critical role in separating and enhancing directional valley exciton emission.
Researchers discovered a novel exciton state in magnetic van der Waals material NiPS3, which is intrinsically a quantum state arising from a transition between two energy states. This breakthrough has significant implications for the field of quantum information and computing.
Researchers found emission from laterally coupled quantum dots is strongly polarized along the coupling direction and can be shaped by changing excitation polarization. This control enables optically-controlled anisotropic wavefunctions, opening new avenues for data storage and thermoelectric energy harvesting.
Researchers from Rensselaer Polytechnic Institute have developed a new method to measure the mass of individual components in quasiparticles, which could play a crucial role in future applications of quantum computing and more efficient energy conversion. The study reveals significant differences in mass between electrons and holes in ...
Researchers at Rice University discovered that excitons can spontaneously form in ground-state bilayers of specific 2D compounds, exhibiting superfluid-like behavior. This phenomenon holds promise for innovative electronic and quantum computing applications.
Researchers from the ARC Centre of Excellence in Exciton Science have developed a highly efficient and controllable method to assemble single nanoparticles directly into pre-patterned templates using electrophoretic deposition. The technique has been applied to various materials, including gold nanocrystals, semiconductor quantum dots,...
A new 3D-printed system developed by Australian scientists can now analyze 16 sample perovskite-based solar cells simultaneously, significantly speeding up the testing process. The invention enables rapid evaluation of performance and commercial potential of new compounds, accelerating the development process for next-gen solar cells.
Researchers have observed light emission from intervalley transitions in monolayer WSe2, which can be used to read out valley information and potentially lead to new types of devices. The transition involves an electron and a hole in opposite valleys recombining with the assistance of defects or lattice vibrations.
Researchers at Arizona State University have discovered a mechanism to produce optical gain in 2D semiconductor materials, enabling the creation of low-power nanolasers. This breakthrough could lead to game-changing applications in supercomputing and data centers.
Researchers at Rensselaer Polytechnic Institute have discovered an optical version of the quantum hall effect, unlocking new properties of excitons in two-dimensional semiconductors. This breakthrough could lead to advancements in quantum computing, memory storage, and solar energy harvesting.
Researchers at Peking University developed a new fluorinated fused-ring electron acceptor with 3D stacking and exciton and charge transport, leading to improved efficiency in organic solar cells. The OSCs based on FINIC showed an efficiency of 14.0%, significantly higher than nonfluorinated INIC-based cells.
Researchers from OIST discovered that as exciton density increased, exciton-exciton annihilation shifted from 1D to 2D due to phosphorene's anisotropic properties. Temperature also played a role, with exciton annihilation reverting to 1D at lower temperatures.
Researchers discovered a new mechanism of optical gain in two-dimensional materials that requires only extremely low input power. This breakthrough has significant implications for the development of energy-efficient photonic devices, potentially reducing the need for high electrical power.
Researchers from Nanyang Technological University, Singapore, demonstrate a convenient way to control exciton flow between different colloidal quantum wells at room temperature through optical signals. They achieve continuous transition among three distinct exciton flow regimes with efficiencies of ~50%, ~90% and ~2%.
Researchers at the University of Chicago have predicted a new state of matter that could efficiently conduct both electricity and energy. They found that quantum entanglement enables the coexistence of these two properties in certain materials, which could lead to significant technological advancements.
Physicists at Vienna University of Technology have discovered a new type of quasi-particle called the pi-ton, which consists of two electrons and two holes. The pi-ton is created by absorbing a photon and decays into another photon, exhibiting properties similar to those of particles.
Researchers have successfully controlled the optical properties of semiconductors using acoustic waves at room temperature. This breakthrough enables the dynamical manipulation of excitonic properties at high speed, opening up new avenues for applications such as acousto-optic devices and sensor technology.
A UC Riverside-led research team has discovered a new quantum process in valleytronics that can speed up the development of this emerging technology. The breakthrough, which uses local energy minima in semiconductors, enables the creation of information processing schemes superior to current charge-based technologies.
Researchers detected energy transfer from excited electrons to the crystal lattice on the femtosecond timescale, enabling the development of materials that retain energy for longer periods. This study contributes to the retardation of decoherence and the creation of quantum information devices such as optical switches.
A research group converts absorbed photons into twice as many excitons with an organic monolayer on a gold nanocluster surface, achieving high-efficiency energy conversion. The researchers also found that the newly formed excitons have a significantly longer lifetime compared to conventional surfaces.
Researchers at Columbia University have developed a new design rule for generating excitons in organic molecules. This innovation enables the creation of more efficient solar cells and opens up new avenues for applications in fields such as photocatalysis, sensors, and imaging.
Researchers observe novel phase of matter, excitonic insulator, in antimony nanoflakes, which could lead to breakthroughs in low-energy electronics. The findings provide a new strategy to search for excitonic insulators and potentially carry exotic superfluids.
Researchers at Rensselaer Polytechnic Institute have discovered a way to manipulate tungsten diselenide to enable faster, more efficient computing and quantum information processing. The findings lay the foundation for future development of next-generation computing and storage devices.
Scientists have found a way to lower the energy required by organic light emitting diodes (OLEDs) by manipulating excitons, pairs of electrons and holes. By developing a new mechanism, researchers were able to create devices with low operating voltage.
Researchers have created a polariton nano-laser that operates at room temperature, enabling more efficient and stable coherent light sources. This breakthrough overcomes challenges in controlling thermal stability of excitons, making it suitable for applications in quantum information systems.
Researchers have successfully demonstrated strong and directionally dependent interactions between remote fluids of excitons, a type of quasi-particle in semiconductors. This breakthrough opens up new avenues for creating exotic states of matter and exploring the properties of dipolar quantum gases and liquids.
Researchers at TU Wien develop innovative light-emitting diode by harnessing radiative decay of exciton complexes in ultra-thin layers, enabling precise control over desired light wavelengths.
Researchers at Berkeley Lab develop method to turn ordinary semiconducting materials into quantum machines, exhibiting extraordinary electronic behavior. The discovery could help revolutionize industries aiming for energy-efficient electronic systems and provide platform for exotic new physics.
Researchers create a unique platform to study quantum optical physics on the nanoscale by stacking 2D materials at angles to trap particles. The team successfully traps hundreds of excitons using a moiré pattern, which can be controlled by a twist, enabling precise manipulation and interaction with individual excitons.
Researchers from Tel Aviv University developed a unique spatiotemporal imaging technique to capture the movement of excitons in 2D materials, revealing unprecedented insights into quantum mechanics. The technology enables ultrafast control and extreme spatiotemporal imaging of condensed matter.
Researchers have discovered chiral surface excitons, particles that spin like planets and annihilate each other on the surface of solids, emitting photoluminescence. The finding has potential applications for devices such as solar cells and electronic displays.
Researchers at New York University have discovered a new type of magnet that exhibits unique properties, including sudden transitions and strong coupling with electric currents. This discovery has the potential to enhance data storage technologies and improve performance bottlenecks.
Researchers have discovered eccentric quantum physics in emerging semiconducting materials, enabling unique radiance and energy-efficiency. These hybrid semiconductors, called halide organic-inorganic perovskite (HOIPs), are easy to produce and apply, with potential applications in lighting and solar panels.
Researchers from EPFL's Laboratory of Nanoscale Electronics and Structures have found a way to control some of the properties of excitons, changing their polarization and generating light. This discovery can lead to a new generation of electronic devices with reduced energy loss and heat dissipation.
A new paper reveals unique excitonic complex particles in atomically thin semiconductors, possessing a new quantum degree of freedom called valley spin. This discovery could lead to novel applications in electronic and optoelectronic devices.
A team of EPFL researchers has created a new type of transistor using excitons, enabling effective operation at room temperature. The breakthrough uses two 2D materials to manipulate exciton lifespans and control their movement, paving the way for optoelectronic devices with reduced energy consumption and increased efficiency.
Researchers have explained 'electron-hole reverse drag' and exciton formation using a multiband approach, revealing the bandgap's role in dual-layer graphene structures. This new understanding opens possibilities for ultra-low dissipation future electronics and room-temperature superfluid flow.
Researchers at Kyushu University have demonstrated a way to split energy in OLEDs, surpassing the 100% limit for exciton production. This new technology uses singlet fission to convert electrical charges into light with high-intensity near-infrared emission.
Researchers have successfully controlled excitonic effects in two-dimensional van der Waals heterostructures, a crucial step towards creating electronics with more controlled properties. The breakthrough allows for the creation of unique new materials for solar panels and electronics.
Researchers at Rice University and Los Alamos National Laboratory developed a scale to measure exciton binding energy in perovskite quantum wells, enabling the design of efficient optoelectronic devices. This breakthrough could impact solar cells, LEDs, and other technologies.
In two-dimensional crystals, researchers identified the nature of interlayer excitons, which consist of positive and negative charge particles separated by space. This discovery enables stronger binding and potentially leads to highly efficient solar cells.
Researchers at Naval Research Laboratory have discovered a new material that emits light much faster than conventional materials, enabling larger power, lower energy use, and faster switching for communication and sensors. The discovery could lead to 20 times more intense LEDs and lasers.
Researchers have discovered a way to minimize waste in solar energy capture by designing materials that can harness previously wasted light. This breakthrough could push solar cell efficiency beyond 30%, addressing limitations of silicon-based solar cells.
Dark excitons, bound pairs of an electron and hole, can store information in their spin state, but reading their spins is hard due to lack of light emission. New experiments overcome this by introducing a microlens that captures more photons, enabling researchers to detect dark exciton spins more efficiently.
Felix Castellano and Cédric Mongin discovered a thermally activated delayed photoluminescence mechanism in CdSe quantum dots, which can be controlled by adjusting the size of the nanoparticle and temperature. This process enables unique photoluminescent properties and could be useful for optoelectronic applications.
Excitonium is a condensate that defies reason, consisting of a boson formed by an escaped electron and a hole it left behind. Researchers at the University of Illinois used a novel technique to measure collective excitations and observed soft plasmon phase, providing definitive evidence for excitonium discovery.
Researchers at MIT and Harvard created a light-harvesting material that can absorb and transfer energy along precise pathways. The synthetic material uses densely packed clusters of pigments organized on DNA scaffolds to mimic natural photosynthetic structures.
Researchers at Kyushu University developed a novel design strategy for efficient light-emitting molecules using excited-state intramolecular proton transfer, achieving highly efficient thermally activated delayed fluorescence. This approach has the potential to improve the stability of OLEDs and unlock new properties.
For the first time, researchers have made real-space images of exciton-polaritons, a combination of light and matter. The creation of these quasiparticles at room temperature could lead to faster circuits and higher bandwidths.
IBS scientists developed a theoretical model for valv polarization in microcavities, which predicts that valleys with opposite polarization can be distinguished and tuned. This could lead to applications in valleytronics by selectively exciting different valleys with polarized laser light.
Researchers have shed light on the absorption of light by anatase titanium dioxide using cutting-edge spectroscopic techniques and theoretical calculations. They discovered that strongly bound excitons exhibit novel properties, including confinement to a two-dimensional plane and stability at room temperature.
Researchers from ITMO University and their European colleagues created quasiparticles called excitons, fully controllable and room-temperature capable. These particles can generate light in LEDs and lasers, while also being used for recording optical signals.
Researchers have found Fermi polarons, a new type of quasiparticle, in a certain type of semiconductors. This discovery challenges the previous assumption that excitons or trions are formed instead. The study provides valuable insights into the material's properties and has implications for basic research and potential applications.
Scientists have found that dye molecules can transfer energy quickly to each other, even when they are different types, which could lead to more efficient ways of harnessing sunlight. This discovery was made using special aggregates of four chromophores and was confirmed by X-ray structural analysis.
A new thermally activated delayed fluorescence (TADF) material has been developed, displaying emission of light in colors from green to deep-red through intersystem crossing. This breakthrough contributes to the development of inexpensive and highly efficient OLEDs.
Researchers at UC San Diego, MIT, and Harvard have engineered 'topological plexcitons,' energy-carrying particles that enhance exciton energy transfer, leading to improved solar cells and miniaturized optical circuits. The discovery provides a directionality feature for efficient energy distribution in nanoscale materials.
Researchers create quasiparticles, directly observe collision events using laser pulses, and shed light on quasiparticles and many-body excitations in condensed matter systems. The findings demonstrate that basic collider concepts from particle physics can be transferred to solid-state research.
Researchers at ORNL have developed a new method that provides unprecedented detail on energy flow in nanometer scale, enabling the improvement of solar cells' performance. The technique uses femtosecond transient absorption microscopy to extract images with single-pixel precision.
A team of US/UK physicists has developed a new material that can control excitons at room temperature, making it easier to manipulate these bound pairs of electrons and electron holes. This breakthrough could lead to the creation of new optoelectronic devices for commercial applications.