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New technique may open new era of atomic-scale semiconductor devices

May 22, 2013 8:08 am | News | Comments

Researchers at North Carolina State University have developed a new technique for creating high-quality semiconductor thin films at the atomic scale—meaning the films are only one atom thick. The technique can be used to create these thin films on a large scale, sufficient to coat wafers that are two inches wide, or larger.

Atomic-scale investigations solve key puzzle of LED efficiency

May 22, 2013 7:58 am | News | Comments

From the high-resolution glow of flat screen televisions to light bulbs that last for years, light-emitting diodes (LEDs) continue to transform technology. Their full potential, however, remains untapped. A contentious controversy surrounds the high intensity of indium gallium nitride, with experts split on whether or not indium-rich clusters within the material provide the LED's remarkable efficiency.

Scientists find new magic in magnetic material

May 8, 2013 4:04 pm | News | Comments

From powerful computers to super-sensitive medical and environmental detectors that are faster, smaller, and use less energy—yes, we want them, but how do we get them? In research that is helping to lay the groundwork for the electronics of the future, University of Delaware scientists have confirmed the presence of a magnetic field generated by electrons which scientists had theorized existed, but that had never been proven until now.

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Microwave cooks up solar cell materials

May 6, 2013 12:56 pm | News | Comments

University of Utah metallurgists have used an old microwave oven to produce a nanocrystal semiconductor rapidly using cheap, abundant, and less toxic metals than other semiconductors. X-ray crystallography, electron microscopy, and atomic spectroscopy all helped confirm that the CZTS (copper, zinc, tin, and sulfur) semiconductor was suitable for use in a solar cell.  

Improving materials that convert heat to electricity and vice-versa

May 6, 2013 7:50 am | News | Comments

Thermoelectric materials can be used to turn waste heat into electricity or to provide refrigeration without any liquid coolants, and a research team from the University of Michigan has found a way to nearly double the efficiency of a particular class of them that's made with organic semiconductors.

Room-temperature nuclear spins advance quantum computing efforts

April 30, 2013 11:42 am | News | Comments

An international team of researchers has recently succeeded in both initializing and reading nuclear spins—which are relevant to qubits for quantum computers—at room temperature. With the help of a spin filter developed in 2009, the team has produced a flow of free electrons with a given spin in a material. 

Semiconductor spray paint could create organic electronics

April 25, 2013 9:46 am | News | Comments

Wake Forest University's Organic Electronics group has developed an organic semiconductor “spray paint” that can be applied to large surface areas without losing electric conductivity. The new spray-deposition method has the advantages of drop casting, spin coating, and prior spray-on techniques: It can applied to large surfaces of any medium, retaining electrical performance.

Engineers generate world-record millimeter-wave output power from nanoscale CMOS

April 25, 2013 7:44 am | News | Comments

A team of  electrical engineers from Columbia University has generated a record amount of power output—by a power of five—using silicon-based nanoscale CMOS technology for millimeter-wave power amplifiers. Power amplifiers are used in communications and sensor systems to boost power levels for reliable transmission of signals over long distances as required by the given application.

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Study unlocks secrets of device that is both battery and memory

April 24, 2013 10:18 am | News | Comments

Unlike the building blocks of conventional hard disk drives and memories, resistive memory cells (ReRAM) are active electrochemical components. In these cells, ions generate voltage on electrodes in a similar manner to a battery. Researchers in Europe have conducted an extensive study of ReRAMs, also described as memristors, and have found previously undiscovered sources of voltage in these devices.

Nanowires grown on graphene have surprising structure

April 23, 2013 7:54 am | News | Comments

When a team of University of Illinois engineers set out to grow nanowires of a compound semiconductor on top of a sheet of graphene, they did not expect to discover a new paradigm of epitaxy. The self-assembled wires have a core of one composition and an outer layer of another, a desired trait for many advanced electronics applications.

Germanium made compatible with lasers

April 22, 2013 9:27 am | News | Comments

By introducing high tensile strain, a research group in Switzerland has rendered germanium, which is normally unsuitable for lasers, capable of emitting 25 times more photons than in its relaxed state. This change alters the optical properties of the material and is enough to allow the construction of lasers from this material. This is valuable because germanium is highly compatible with silicon.

Researchers develop device to mitigate blackouts, prevent equipment damage

April 19, 2013 7:54 am | News | Comments

A local power failure in Ohio ten years ago caused a series of cascading power failures that resulted in a massive blackout. Such blackouts could be prevented in the future, thanks to a new piece of equipment developed by engineering researchers at the University of Arkansas. The device regulates or limits the amount of excess current that moves through the power grid when a surge occurs.

Layered 2D nanocrystals promising new semiconductor

April 16, 2013 8:52 am | News | Comments

Researchers are developing a new type of semiconductor technology for future computers and electronics based on "2D nanocrystals" layered in sheets less than a nanometer thick that could replace today's transistors. The layered structure is made of a material called molybdenum disulfide, which belongs to a new class of semiconductors—metal di-chalogenides—emerging as potential candidates to replace today's CMOS technology.

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Redesigned material could lead to lighter, faster electronics

April 10, 2013 12:57 pm | News | Comments

The same material that formed the first primitive transistors more than 60 years ago can be modified in a new way to advance future electronics, according to a new study. Chemists at The Ohio State University have developed the technology for making a one-atom-thick sheet of germanium, and found that it conducts electrons more than ten times faster than silicon and five times faster than conventional germanium.

Researchers invent better single-photon emitter for quantum cryptography

April 9, 2013 6:31 pm | News | Comments

In a development that could make the advanced form of secure communications known as quantum cryptography more practical, University of Michigan researchers have demonstrated a simpler, more efficient single-photon emitter that can be made using traditional semiconductor processing techniques.

High-efficiency neutron imaging detector features new oblique design

March 31, 2013 6:53 pm | News | Comments

To increase the neutron detection efficiency of bulk-micromegas (MICRO-MEsh GAseous Structure) neutron detectors, researchers from China and the University of Tennessee-Knoxville have proposed three new types of thin-film converters: micro-channel, parallel micro-pillar, and oblique micro-pillar 2D array. When validated using Monte Carlo simulations, the latter design showed a threefold increase in neutron detection efficiencies.

Engineers enable bulk silicon to emit visible light for the first time

March 27, 2013 2:56 pm | News | Comments

Certain semiconductors, when imparted with energy, in turn emit light; they directly produce photons, instead of producing heat. This phenomenon is commonplace and used in light-emitting diodes, or LEDs. Research from the University of Pennsylvania has enabled "bulk" silicon to emit broad-spectrum, visible light for the first time, opening the possibility of using the element in devices that have both electronic and photonic components.

Atomic layer etch analysis accelerates green chemistries

March 26, 2013 8:28 am | News | Comments

Researchers sponsored by Semiconductor Research Corporation (SRC) have developed a modeling process designed to simulate atomic-level etching with chemicals that are effective alternatives to widely used perfluorocarbon (PFC) gases. The novel approach will identify and evaluate green plasma chemistries for processing emerging memory/logic devices and through-silicon-via (TSV)-enabled technologies for the semiconductor industry.

Paint-on plastic electronics

March 25, 2013 7:51 am | News | Comments

Semiconducting polymers are an unruly bunch, but University of Michigan engineers have developed a new method for getting them in line that could pave the way for cheaper, greener, "paint-on" plastic electronics.

Researchers improve laser potential of MEH-PPV polymer

March 18, 2013 1:45 pm | News | Comments

MEH-PPV is a low-cost polymer that can be integrated with silicon chips, and researchers have sought to use it to convert electricity into laser light for use in photonic devices. However, attempts to do this have failed because the amount of electricity needed to generate laser light in MEH-PPV was so high that it caused the material to degrade. Researchers have recently come up with a low-cost way to enhance MEH-PPV’s ability to confine light, protecting the material.

MIT researchers develop solar-to-fuel roadmap for crystalline silicon

March 5, 2013 11:12 am | by David L. Chandler, MIT News Office | News | Comments

Bringing the concept of an “artificial leaf” closer to reality, a team of researchers at Massachusetts Institute of Technology has published a detailed analysis of all the factors that could limit the efficiency of such a system. The new analysis lays out a roadmap for a research program to improve the efficiency of these systems, and could quickly lead to the production of a practical, inexpensive and commercially viable prototype.

Connecting the quantum dots

February 26, 2013 12:51 pm | News | Comments

Recent research offers a new spin on using nanoscale semiconductor structures to build faster computers and electronics. Literally. Researchers have revealed a new method that better preserves the units necessary to power lightning-fast electronics, known as qubits. Hole spins, rather than electron spins, can keep quantum bits in the same physical state up to 10 times longer than before, the report finds.

Scientists develop multi-color LEDs without heavy metals

February 22, 2013 8:57 am | News | Comments

Silicon dominates in microelectronics and photovoltaics industry, but has been considered unsuitable for light-emitting diodes for a long time. At the nanoscale, however, its properties change. Scientists in Germany and Canada have now succeeded in manufacturing silicon-based light-emitting diodes (SiLEDs) using silicon nanocrystals a few nanometers in size. They are free of heavy metals and can emit light in various colors.

Researchers create semiconductor "nano-shish-kebabs"

February 19, 2013 3:16 pm | News | Comments

Researchers at North Carolina State University have developed a new type of nanoscale structure that resembles a “nano-shish-kebab,” consisting of multiple 2D nanosheets that appear to be impaled upon a 1D nanowire. However, the nanowire and nanosheets are actually a single, 3D structure consisting of a seamless series of germanium sulfide (GeS) crystals. The structure holds promise for use in the creation of new, 3D technologies.

Production process doubles speed, efficiency of flexible electronics

February 19, 2013 10:44 am | News | Comments

Stretched-out clothing might not be a great practice for laundry day, but in the case of microprocessor manufacture, stretching out the atomic structure of the silicon in the critical components of a device can be a good way to increase a processor's performance.

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