Transistors are the building blocks of the electronic devices that power the digital world, and much of the growth in computing power over the past 40 years has been made possible by increases in the number of transistors that can be packed onto silicon chips.
But that growth, if left to current technology, may soon be coming to an end.
Many in the semiconductor field think that the industry is fast approaching the physical limits of transistor miniaturization. The major problem in modern transistors is power leakage leading to the generation of excessive heat from billions of transistors in close proximity.
The recent advances at Notre Dame and Penn State—who are partners in the Midwest Institute for Nanoelectronics Discovery (MIND)—show that TFETs are on track to solve these problems by delivering comparable performance to today's transistors, but with much greater energy efficiency.
They do this by taking advantage of the ability of electrons to "tunnel" through solids, an effect that would seem like magic at the human scale but is normal behavior at the quantum level.
"A transistor today acts much like a dam with a moveable gate" says Alan Seabaugh, professor of electrical engineering at Notre Dame and the Frank M. Freimann Director of MIND. "The rate at which water flows, the current, depends on the height of the gate."
"With tunnel transistors, we have a new kind of gate, a gate that the current can flow through instead of over. We adjust the thickness of the gate electrically to turn the current on and off."
"Electron tunneling devices have a long history of commercialization," adds Seabaugh, "You very likely have held more than a billion of these devices in a USB flash drive. The principle of quantum mechanical tunneling is already used for data storage devices."
While TFETs don't yet have the energy efficiency of current transistors, papers released in December 2011 by Penn State and March 2012 by Notre Dame demonstrate record improvements in tunnel transistor drive current, and more advances are expected in the coming year.
"Our developments are based on finding the right combination of semiconductor materials with which to build these devices," says Suman Datta, professor of electrical engineering at Penn State University.
"If we're successful, the impact will be significant in terms of low power integrated circuits. These, in turn, raise the possibility of self-powered circuits which, in conjunction with energy harvesting devices, could enable active health monitoring, ambient intelligence, and implantable medical devices."
Another benefit of tunneling transistors is that using them to replace existing technology wouldn't require a wholesale change in the semiconductor industry. Much of the existing circuit design and manufacturing infrastructure would remain the same.
"Strong university research on novel devices such as TFETs is critical for continuing the rapid pace of technology development," said Jeff Welser, director of the Nanoelectronics Research Initiative. "Much of the industry recognizes that it will take collaborations with both academia and government agencies to find and develop these new concepts."
Two other partners in the MIND center—Purdue University and The University of Texas at Dallas—have made significant contributions to the development of TFETs through the development of key modeling and analytical tools.
The Midwest Institute for Nanoelectronics Discovery (MIND) is one of four centers funded by the Semiconductor Research Corporation's Nanoelectronics Research Initiative (NRI). The goal of NRI and its university-based centers is to demonstrate novel computing devices capable of replacing the complementary metal oxide semiconductor (CMOS) transistor as a logic switch. Established in 2008, MIND is led by the University of Notre Dame and includes Pennsylvania State University, Purdue University, and University of Texas-Dallas.
Alan Seabaugh | EurekAlert!
First evidence on the source of extragalactic particles
13.07.2018 | Technische Universität München
Simpler interferometer can fine tune even the quickest pulses of light
12.07.2018 | University of Rochester
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
13.07.2018 | Event News
13.07.2018 | Materials Sciences
13.07.2018 | Life Sciences