Chemists from Brown Univ. have found a way to make new 2-D, graphene-like semiconducting nanomaterials using an old standby of the semiconductor world: silicon. In a paper published in Nanoletters, the researchers describe methods for making nanoribbons and nanoplates from a compound called silicon telluride. The materials are pure, p-type semiconductors that could be used in a variety of electronic and optical devices.
Univ. of Washington scientists have built a new nanometer-sized laser that is energy efficient,...
Computer chips, solar cells and other electronic devices have traditionally been based on...
A team of Columbia Engineering researchers has invented a technology, full-duplex radio integrated circuits (ICs), that can be implemented in nanoscale CMOS to enable simultaneous transmission and reception at the same frequency in a wireless radio. Up to now, this has been thought to be impossible: transmitters and receivers either work at different times or at the same time but at different frequencies.
Engineers at The Univ. of Texas at Dallas have created semiconductor technology that could make night vision and thermal imaging affordable for everyday use. The engineers created an electronic device in affordable technology that detects electromagnetic waves to create images at nearly 10 THz, which is the highest frequency for electronic devices. The device could make night vision and heat-based imaging affordable.
A superconductor that works at room temperature was long thought impossible, but scientists at the Univ. of Southern California may have discovered a family of materials that could make it reality. The team found that aluminum "superatoms" appear to form Cooper pairs of electrons at temperatures around 100 K. Though 100 K is still pretty chilly, this is an increase compared to bulk aluminum metal.
Graphene shows great promise for future electronics, advanced solar cells, protective coatings and other uses, and combining it with other materials could extend its range even further. Experiments at the SLAC National Accelerator Laboratory looked at the properties of materials that combine graphene with a common type of semiconducting polymer.
A new semiconductor compound is bringing fresh momentum to the field of spintronics, an emerging breed of computing device that may lead to smaller, faster, less power-hungry electronics. Created from a unique low-symmetry crystal structure, the compound is the first to build spintronic properties into a material that's stable at room temperature and easily tailored to a variety of applications.
Anyone who has ever toasted the top of their legs with their laptop or broiled their ear on a cell phone knows that microelectronic devices can give off a lot of heat. These devices contain a multitude of transistors, and although each one produces very little heat individually, their combined thermal output is significant and can damage the device.
Lawrence Berkeley National Laboratory researchers have developed a nano-sized optical antenna that can greatly enhance the spontaneous emission of light from atoms, molecules and semiconductor quantum dots. This advance opens the door to light-emitting diodes (LEDs) that can replace lasers for short-range optical communications, including optical interconnects for microchips, plus a host of other potential applications.
A potential avenue to quantum computing currently generating quite the buzz in the high-tech industry is “valleytronics,” in which information is coded based on the wavelike motion of electrons moving through certain 2-D semiconductors. Now, a promising new pathway to valleytronic technology has been uncovered by researchers with the Lawrence Berkeley National Laboratory.
Researchers in Japan revealed that improvements should soon be expected in the manufacture of transistors that can be used, for example, to make flexible, paper-thin computer screens. The scientists reviewed the latest developments in research on photoactive organic field-effect transistors, devices that incorporate organic semiconductors, amplify weak electronic signals and either emit or receive light.
A new semiconductor laser developed at Yale Univ. has the potential to significantly improve the imaging quality of the next generation of high-tech microscopes, laser projectors, photo lithography, holography and biomedical imaging. Based on a chaotic cavity laser, the technology combines the brightness of traditional lasers with the lower image corruption of light-emitting diodes.
2-D materials, such as molybdenum-disulfide, are attracting much attention for future electronic and photonic applications ranging from high-performance computing to flexible and pervasive sensors and optoelectronics. But in order for their promise to be realized, scientists need to understand how the performance of devices made with 2-D materials is affected by different kinds of metal electrical contacts.
Organic semiconductors are prized for light-emitting diodes, field effect transistors and photovoltaic cells. As they can be printed from solution, they provide a highly scalable, cost-effective alternative to silicon-based devices. Uneven performances, however, have been a persistent problem.
Scientists at Oak Ridge National Laboratory are learning how the properties of water molecules on the surface of metal oxides can be used to better control these minerals and use them to make products such as more efficient semiconductors for organic light-emitting diodes and solar cells, safer vehicle glass in fog and frost and more environmentally friendly chemical sensors for industrial applications.
A team of researchers led by North Carolina State University has found that stacking materials that are only one atom thick can create semiconductor junctions that transfer charge efficiently, regardless of whether the crystalline structure of the materials is mismatched.
A laboratory at Purdue Univ. provided a critical part of the world's first transistor in 1947—the purified germanium semiconductor—and now researchers here are on the forefront of a new germanium milestone. The team has created the first modern germanium circuit—a complementary metal–oxide–semiconductor (CMOS) device—using germanium as the semiconductor instead of silicon.
Materials first developed at Oregon State Univ. more than a decade ago with an eye toward making “transparent” transistors may be about to shake up the field of consumer electronics; and the first uses are not even based on the transparent capability of the materials. In the continued work and in collaboration with private industry, certain transparent transistor materials are now gaining some of their first commercial applications.
Argonne National Laboratory has announced a new intellectual property licensing agreement with AKHAN Semiconductor, continuing a productive public-private partnership that will bring diamond-based semiconductor technologies to market. The agreement gives AKHAN exclusive rights to a suite of breakthrough diamond-based semiconductor inventions developed by nanoscientist Ani Sumant of Argonne’s Center for Nanoscale Materials.
If LCD TVs get more colorful in the next few years, it will probably be thanks to QD Vision, a pioneer of quantum-dot television displays. Quantum dots are light-emitting semiconductor nanocrystals that can be tuned to emit all colors across the visible spectrum. By tuning these dots to red and green, and using a blue backlight to energize them, QD Vision has developed an optical component that can boost the color gamut for LCD televisions.
Silicon is the second-most-abundant element in the Earth's crust. When purified, it takes on a diamond structure, which is essential to modern electronic devices—carbon is to biology as silicon is to technology. A team of Carnegie scientists has synthesized an entirely new form of silicon, one that promises even greater future applications.
Physicists at Australian National Univ. have engineered a spiral laser beam and used it to create a whirlpool of hybrid light-matter particles called polaritons. The ability to control polariton flows in this way could aid the development of completely novel technology to link conventional electronics with new laser and fiber-based technologies.
Since the 1850s scientists have known that crystalline materials are organized into fourteen different basic lattice structures. However, a team of researchers from Vanderbilt Univ. and Oak Ridge National Laboratory now reports that it has discovered an entirely new form of crystalline order that simultaneously exhibits both crystal and polycrystalline properties, which they describe as "interlaced crystals."
Researchers from North Carolina State Univ. have developed a new way to transfer thin semiconductor films, which are only one atom thick, onto arbitrary substrates, paving the way for flexible computing or photonic devices. The technique is much faster than existing methods and can perfectly transfer the atomic scale thin films from one substrate to others, without causing any cracks.
Researchers from North Carolina State Univ. and Hong Kong Univ. of Science and Technology have found that temperature-controlled aggregation in a family of new semiconducting polymers is the key to creating highly efficient organic solar cells that can be mass produced more cheaply. Their findings also open the door to experimentation with different chemical mixtures that comprise the active layers of the cells.
A new class of low-cost polymer materials, which can carry electric charge with almost no losses despite their seemingly random structure, could lead to flexible electronics and displays which are faster and more efficient.
Researchers in Japan have directly observed and recorded electron flow at 80,000 m/sec in a semiconductor. They did so by combining a new laser pulse light source and a photoemission electron microscope to develop an ultra high-speed microscope that enabled visualization of electrons on a 20 nm and 200 femtosec scale.
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