A revolution is coming in flexible electronic technologies as cheaper, more flexible, organic transistors come on the scene to replace expensive, rigid, silicone-based semiconductors, but not enough is known about how bending in these new thin-film electronic devices will affect their performance, say materials scientists at the Univ. of Massachusetts Amherst.
Researchers at the Univ. of Rochester have shown that defects on an atomically thin...
Making thin films out of semiconducting materials is analogous to how ice grows on a windowpane...
As microchip feature dimensions approach atomic scale, it becomes formidably difficult to...
In 2013 James Hone, Wang Fong-Jen Professor of Mechanical Engineering at Columbia Engineering, and colleagues at Columbia demonstrated that they could dramatically improve the performance of graphene—highly conducting two-dimensional (2-D) carbon—by encapsulating it in boron nitride (BN), an insulating material with a similar layered structure.
The editors of R&D Magazine have announced a deadline extension for the 2015 R&D 100 Awards entry process until May 18, 2015. The R&D 100 Awards have a 50 plus year history of awarding the 100 most technologically significant products of the year.
A potentially game-changing breakthrough in artificial photosynthesis has been achieved with the development of a system that can capture carbon dioxide emissions before they are vented into the atmosphere and then, powered by solar energy, convert that carbon dioxide into valuable chemical products, including biodegradable plastics, pharmaceutical drugs and even liquid fuels.
Water is the key component in a Rice Univ. process to reliably create patterns of metallic and semiconducting wires less than 10 nm wide. The technique by the Rice lab of chemist James Tour builds upon its discovery that the meniscus, the curvy surface of water at its edge, can be an effective mask to make nanowires.
Researchers have collaborated in the study of the movement of charges over interfaces of semiconductor materials. The group noticed a new kind of transport phenomenon for charges. In the phenomenon, a pair formed by a negative electron and a positive charge moves onto an interface, after which its “message” is passed on to the other side of the interface, where it is carried on by a similar pair.
The promising new material molybdenum disulfide has an inherent issue that’s steeped in irony. The material’s greatest asset, its monolayer thickness, is also its biggest challenge. Monolayer molybdenum disulfide’s ultra-thin structure is strong, lightweight and flexible, making it a good candidate for many applications, such as high-performance, flexible electronics.
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, easy to build and compatible with existing electronics. Lasers play essential roles in countless technologies, from medical therapies to metal cutters to electronic gadgets. But to meet modern needs in computation, communications, imaging and sensing, scientists are striving to create ever-smaller laser systems that also consume less energy.
Computer chips, solar cells and other electronic devices have traditionally been based on silicon, the most famous of the semiconductors, that special class of materials whose unique electronic properties can be manipulated to turn electricity on and off the way faucets control the flow of water. There are other semiconductors. Gallium arsenide is one such material and it has certain technical advantages over silicon.
Graphene quantum dots made from coal, introduced in 2013 by the Rice Univ. laboratory of chemist James Tour, can be engineered for specific semiconducting properties in either of two single-step processes. In a new study, Tour and colleagues demonstrated fine control over the graphene-oxide dots’ size-dependent band gap, the property that makes them semiconductors.
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.
- Page 1