Junxia Shi, a graduate student in the laboratory of Lester Eastman, the John Given Foundation Professor of Engineering, developed the gallium nitride-based device, which could form the basis for the circuitry in products from laptops to hybrid vehicles to windmills to other power electronic systems.
The patent-pending device is a basic electrical switch made from the compound gallium nitride, a material with unique electrical properties that Eastman and colleagues have been studying for more than a decade. Research on their recent breakthrough was published in the journal Applied Physics Letters (July 28, 2009).
The new transistor’s on-resistance, or measure of resistance to electric current, is 10 to 20 times lower than today’s silicon-based power devices. It also has a high breakdown voltage, which is a measure of how much voltage can be applied across a material before it fails.
The key to the device lie in gallium nitride’s low electrical resistance, causing less power loss to heat, and its ability to handle up to 3 million volts per centimeter without electrical failure. Silicon, a competing material, can handle only about 250,000 volts per centimeter.At the heart of improving electronics, Eastman said, is the ability to make devices that can switch electricity from high voltage to high current, which is a measurement of electrical applicability, while minimizing power loss.
“Power has to go from A to B in a machine with a high voltage transmission line to minimize power loss,” Eastman said. “Before now, there were no electronic devices that could handle both high current and the high voltage, but our device can do it.”
The transistors, which were made with Cornell nanofabrication equipment, might one day power everything from hybrid electric vehicles to Navy destroyers. In fact, the U.S. Navy first funded Cornell’s research into gallium nitride transistors more than 10 years ago and is a major funder of Eastman’s research today.
In next-generation electrical devices, “you want to have the power that’s coming out to be not much less than the power that’s going in,” Eastman said. “This is the best material we know of that can do this conversion without loss of energy.”
Shi and Eastman have a provisional patent on their device. The New Jersey-based company Velox and Motorola spinoff Freescale have also helped fund the research, with the hope of producing the devices at an industrial scale.
Blaine Friedlander | Newswise Science News
Sharpening the X-ray view of the nanocosm
23.03.2018 | Changchun Institute of Optics, Fine Mechanics and Physics
Drug or duplicate?
23.03.2018 | Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
23.03.2018 | Event News
19.03.2018 | Event News
16.03.2018 | Event News
23.03.2018 | Materials Sciences
23.03.2018 | Agricultural and Forestry Science
23.03.2018 | Physics and Astronomy