Current Photodetectors News and Events

Current Photodetectors News and Events, Photodetectors News Articles.
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3D-printing perovskites on graphene makes next-gen X-ray detectors
By using 3D aerosol jet-printing to put perovskites on graphene, scientists at EPFL have made X-ray detectors with record sensitivity that can greatly improve the efficiency and reduce the cost and health hazard of medical imaging devices. (2021-02-17)

Researchers design next-generation photodetector
The new long-wavelength infrared photodetector from Professor Manijeh Razeghi could be used in night vision, optical communication, and thermal and medical imaging. (2021-02-02)

Compelling evidence of neutrino process opens physics possibilities
The COHERENT particle physics experiment at the Department of Energy's Oak Ridge National Laboratory has firmly established the existence of a new kind of neutrino interaction. Because neutrinos are electrically neutral and interact only weakly with matter, the quest to observe this interaction drove advances in detector technology and has added new information to theories aiming to explain mysteries of the cosmos. (2021-01-26)

Reducing traps increases performance of organic photodetectors
Physicists at the Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) discovered that trap states rule the performance of organic photodetectors, ultimately limiting their detectivity. These highly promising results have now been published in the renowned scientific journal Nature Communications. (2021-01-22)

A new method for the functionalization of graphene
An international research team involving Professor Federico Rosei of the Institut national de la recherche scientifique (INRS) has demonstrated a novel process to modify the structure and properties of graphene, a one atom thick carbon. (2020-12-16)

"Game changer" perovskite can detect gamma rays
Scientists at EPFL have developed a game-changing perovskite material that can be used as a cheaper and highly efficient alternative to gamma-ray detectors. (2020-12-09)

Researchers find conformational disorder tuning charge carrier mobility in 2D perovskites
Researchers from the University of Science and Technology of China synthesized a series of 2D organic-inorganic hybrid perovskites films with large organic spacer cations, and found that mobility and broadband emission showed strong dependence on the molecular conformational order of organic cations. (2020-11-23)

Highly sensitive detection of circularly polarized light without a filter
Japanese scientists developed a photodiode using a crystalline film composed of lead perovskite compounds with organic chiral molecules to detect circularly polarized light without a filter. It is expected as a technology for visualization of the invisible change of object surfaces such as stress intensity and distribution. (2020-11-16)

Cascade amplified upconversion luminescence facilitating narrow band NIR photodetection
Facing the fact that selective detection of multiple narrow spectral bands in the near-infrared (NIR) region still poses a fundamental challenge. Towards this goal, Hongwei Song's group and Liu developed selectively multispectral narrow-band near-infrared photodetection using photon upconversion nanocrystals (UCNCs) through a cascade optical field modulation strategy. They demonstrated for the first time that the response to the excitation modulation frequency of a PD can be employed to discriminate the incident light wavelength. (2020-11-11)

Optoelectronic detectors capable of perceiving light intensity and color
Current optoelectronic detectors are only able to perceive light intensities. Although multi-photosensor spectrometers are capable of perceiving intensity and colour, they require chip-level assembly and can generate redundant signals. Scientists in China have created a low cost, flexible device consists of a photoactive layer made from a semiconductor with a small bandgap and a photosensing layer made from a semiconductor with gradient bandgaps, which is capable of detecting light intensity and perceiving colour. (2020-11-11)

Large-area flexible organic photodiodes can compete with silicon devices
The performance of flexible large-area organic photodiodes has advanced to the point that they can now offer advantages over conventional silicon photodiode technology, particularly for applications such as biomedical imaging and biometric monitoring that require detecting low levels of light across large areas. (2020-11-05)

Scientists develop method to detect charge traps in organic semiconductors
Scientists at Swansea University have developed a very sensitive method to detect the tiny signatures of so called 'charge traps' in organic semiconductors. (2020-11-04)

Research lays groundwork for ultra-thin, energy efficient photodetector on glass
Though we may not always realize it, photodetectors contribute greatly to the convenience of modern life. Also known as photosensors, photodetectors convert light energy into electrical signals to complete tasks such as opening automatic sliding doors and automatically adjusting a cell phone's screen brightness in different lighting conditions. (2020-11-04)

A versatile photodetector assisted by photovoltaic and bolometric effects
A versatile photodetector based on MoTe2/VO2 heterostructure integrates photovoltaic and bolometric effects. The photodetector can realize three different functional modes including p-n junction, bolometer and Schottky junction, satisfying the demand of ultrasensitive and ultrabroad spectrum response, showing great potential in advanced photodetector. (2020-11-01)

Promising strategies for durable perovskite solar cells
Perovskite materials are increasingly popular as the active layer in solar cells, but internal forces in these materials cause distortions in their crystal structures, reducing symmetry and contributing to their intrinsic instability. Researchers at Soochow University examined the mechanisms at play, as well as several degradation factors that influence the performance of perovskite photovoltaics. In APL Materials, they clarified the factors influencing the degradation and they summarized some feasible approaches for durable perovskite photovoltaics. (2020-10-27)

Scientists develop detector for investigating the sun
Researchers from MIPT have developed a prototype detector of solar particles. The device is capable of picking up protons at kinetic energies between 10 and 100 megaelectronvolts, and electrons at 1-10 MeV. This covers most of the high-energy particle flux coming from the sun. The new detector can improve radiation protection for astronauts and spaceships, as well as advancing our understanding of solar flares. (2020-10-13)

Chemical innovation stabilizes best-performing perovskite formulation
Publishing in Science, researchers at EPFL have successfully overcome a limiting problem with stabilizing the best-performing formulation of metal-halide perovskite films, a key player in a range of applications, including solar cells. (2020-10-01)

Thin and ultra-fast photodetector sees the full spectrum
Researchers have developed the world's first photodetector that can see all shades of light, in a prototype device that radically shrinks one of the most fundamental elements of modern technology. (2020-09-22)

Nanophysics - Spectral classification of excitons
Ultrathin layers of tungsten diselenide have potential applications in opto-electronics and quantum technologies. Ludwig-Maximilians-Universitaet (LMU) in Munich researchers have now explored how this material interacts with light in the presence of strong magnetic fields. (2020-09-10)

CU student helps bridge teams at Clemson
Three teams of researchers at Clemson University have joined forces to unravel some of the mysteries surrounding perovskite nanocrystals, which are semiconductors with numerous applications, including LEDs, lasers, solar cells and photodetectors. (2020-08-20)

Coffee stains inspire optimal printing technique for electronics
Using an alcohol mixture, researchers modified how ink droplets dry, enabling cheap industrial-scale printing of electronic devices at unprecedented scales. (2020-08-12)

Strainoptronics: A new way to control photons
Researchers discovered a new way to engineer optoelectronic devices by stretching a two-dimensional material on top of a silicon photonic platform. (2020-06-22)

Vapor fix lifts up perovskite crystal performance
A facile and mild bromine treatment eliminates surface and bulk defects from perovskites to boost the materials' optoelectronic properties. (2020-06-18)

First measurement of electron energy distributions, could enable sustainable energy technologies
To answer a question crucial to technologies such as energy conversion, a team of researchers at the University of Michigan, Purdue University and the University of Liverpool in the UK have figured out a way to measure how many 'hot charge carriers' -- for example, electrons with extra energy -- are present in a metal nanostructure. (2020-06-05)

Discovery unlocks 'hot' electrons for more efficient energy use
Researchers have demonstrated how a technique using a scanning tunneling microscope integrated with lasers and other optical components reveals the energy distribution of hot electrons. (2020-06-04)

Graphene heterostructures with black phosphorus, arsenic enable new infrared detectors
MIPT scientists and their colleagues from Japan and the U.S. have calculated the parameters of photodetectors comprised by layers of graphene and a combination of black phosphorus and black arsenic. These sensors are able to detect radiation with energy less than the band gap of the constituent layers without graphene. (2020-04-13)

A combined optical transmitter and receiver
Researchers at Linköping University, together with colleagues in China, have developed a tiny unit that is both an optical transmitter and a receiver. ''This is highly significant for the miniaturisation of optoelectronic systems'', says LiU professor Feng Gao. The results have been published in Nature Electronics. (2020-04-03)

Ultrafast and broadband perovskite photodetectors for large-dynamic-range imaging
A solution-processed broadband photodetector based on organic-inorganic hybrid perovskite and organic bulk heterojunction has been demonstrated, achieving broadband response spectra up to 1000 nm with a high EQE in the NIR region, an ultrafast response speed of 5.6 ns and a wide linear dynamic range of 191 dB. Encouragingly, due to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is obtained, enabling the accelerated translation of solution-processed photodetector applications from the laboratory to the imaging market (2020-03-23)

Water-induced MAPbBr3@PbBr(OH) with enhanced luminescence and stability
Lead halide perovskites are materials that emit light with a range of colors, but also suffer from poor moisture stability. Scientist in China demonstrated a new synthetic technique that can enable perovskites to emit bright fluorescent light by addition a dose of water, even when submerged under water for more than a year. Successful fabrication of the hydrated crystals as phosphors within light-emitting devices indicates their potential for industrial purposes. (2020-03-23)

Silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm
Waveguide photodetectors beyond 1.55 μm are becoming very attractive for many applications. Recently, researchers from Zhejiang University and Southeast University in China proposed and realized high-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm (e.g., 2 μm), by introducing an ultra-thin wide silicon-graphene hybrid plasmonic waveguide with efficient light absorption in graphene. This work paves the way for achieving high-responsivity and high-speed near/mid-infrared waveguide photodetectors on silicon. (2020-03-13)

Neural hardware for image recognition in nanoseconds
Usually, artificial intelligence is based on software. Scientists at TU Wien (Vienna) created intelligent hardware, which is much faster. Within nanoseconds, the chip can analyze images and provide the correct output. (2020-03-05)

Colloidal Quantum Dot Photodetectors can now see further than before
An ICFO study published in Nanoletters reports on the development of a colloidal quantum dot photodetector capable of detecting light in the far infrared. (2020-01-16)

Growing strained crystals could improve performance of perovskite electronics
A new method could enable researchers to build more efficient, longer lasting perovskite solar cells and LEDs. By growing thin perovskite films on different substrates, UC San Diego engineers invented a way of fabricating perovskite single crystals with precisely deformed, or strained, structures. (2020-01-09)

Super-resolution at all scales with active thermal detection
IBS research team found the temperature increase caused by the probe beam could be utilized to generate a signal per se for detecting objects. Notably, this so-called 'active thermal detection' enables super-resolution imaging at all scales. (2019-12-22)

Light-trapping nanocubes drive inexpensive multispectral camera
Researchers at Duke University have demonstrated photodetectors that could span an unprecedented range of light frequencies through on-chip spectral filters created by tailored electromagnetic materials. The combination of multiple photodetectors with different frequency responses on a single chip could enable lightweight, inexpensive multispectral cameras for applications such as cancer surgery, food safety inspection and precision agriculture. (2019-11-25)

Drexel's MXene materials help photodetectors see the light
Using a special type of two-dimensional material, researchers at Drexel University have developed a new way to make light sensors that improves their sensitivity and could allow manufacturers to keep up with the growing demand for their use in devices ranging from television remotes to fiber optic receivers in data centers, and light detecting and ranging systems (LiDAR) in autonomous vehicles. (2019-11-12)

Graphene turns 15 on track to deliver on its promises
In a special Nature Nanotechnology issue celebrating 15 years since the Nobel Prize-winning 'ground-breaking experiments on graphene,' the Graphene Flagship analyses the current graphene landscape and market forecast for graphene over the following decade. (2019-10-04)

Silicon technology boost with graphene and 2D materials
In a review published in Nature, ICFO researchers and collaborators report on the current state, challenges, opportunities of graphene and 2D material integration in Silicon technology. (2019-09-30)

Kaleidoscope mirror symmetry inspires new design for optical tools, technologies
In a kaleidoscope, mirrors are placed at angles to create a visual illusion of multiple, symmetric images from one object. Researchers started with a cylindrical vector optical field and introduce a kaleidoscope structure to the polarization states by assigning a parameter for mirror-symmetric axes. (2019-09-17)

New breakthrough: Photomultiplication type all-polymer photodetectors with single carrier transport
The optimal photomultiplication (PM) type all-PPDs with PBDB-T:PZ1 (100:3, wt/wt) as active layers exhibit EQE of > 100% from 310 to 790 nm. Under 675 nm light illumination, the champion EQE arrives to 1470% and the specific detectivity to 10^12 Jones. The PM phenomenon in all-PPDs results from hole tunneling injection assisted by interfacial band bending induced by trapped electrons in PZ1 near Al electrodes. (2019-09-08)

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