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Friday, 15 May 2020

Electronic diodes beyond 5G performance created


David Storm, a research physicist, and Tyler Growden, an electrical engineer, both with the U.S. Naval Research Laboratory, developed a new gallium nitride-based electrical component called a resonant tunneling diode (RTD) with performance beyond the anticipated speed of 5G.

The fifth-generation network technology is now just starting to roll out across the United States.

Storm and Growden's electronic component diode research findings were published March 19, 2020 in the academic journal Applied Physics Letters.



"Our work showed that gallium nitride-based RTDs are not inherently slow, as others suggested," Growden said. "They compare well in both frequency and output power to RTDs of different materials."

The diodes enable extremely fast transport of electrons to take advantage of a phenomenon called quantum tunneling. In this tunneling, electrons create current by moving through physical barriers, taking advantage of their ability to behave as both particles and waves.

Storm and Growden's design for gallium nitride-based diodes displayed record current outputs and switching speeds, enabling applications requiring electromagnetics in the millimeter-wave region and frequencies in terahertz. Such applications could include communications, networking, and sensing.

The team developed a repeatable process to increase the diodes yield to approximately 90%; previous typical yields range around 20%.

Storm said accomplishing a high yield of operational tunneling devices can be difficult because they require sharp interfaces at the atomic level and are very sensitive to many sources of scattering and leakage.

Sample preparation, uniform growth, and a controlled fabrication process at every step were the key elements to the diodes satisfactory results on a chip.

"Until now, gallium nitride was difficult to work with from a manufacturing perspective," Storm said. "I hate to say it, but our high yield was as simple as falling off a log, and a lot of it was due to our design."



Storm and Growden said they are committed to continue refining their RTD design to improve the current output without losing power potential. They performed their work along with colleagues at Ohio State University, Wright State University, as well as industry partners.


Bibliography:

Tyler A. Growden, David F. Storm, Evan M. Cornuelle, Elliott R. Brown, Weidong Zhang, Brian P. Downey, Jason A Roussos, Nicholas Cronk, Laura B. Ruppalt, James G. Champlain, Paul R. Berger, David J. Meyer.


Superior growth, yield, repeatability, and switching performance in GaN-based resonant tunneling diodes.

Applied Physics Letters, 2020; 116 (11): 113501

DOI: 10.1063/1.5139219

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