Featured Research

from universities, journals, and other organizations

Illinois Researchers Create World's Fastest Transistor -- Again

Date:
November 10, 2003
Source:
University Of Illinois At Urbana-Champaign
Summary:
Researchers at the University of Illinois at Urbana-Champaign have broken their own record for the world's fastest transistor. Their latest device, with a frequency of 509 gigahertz, is 57 gigahertz faster than their previous record holder and could find use in applications such as high-speed communications products, consumer electronics and electronic combat systems.

CHAMPAIGN, Ill. -- Researchers at the University of Illinois at Urbana-Champaign have broken their own record for the world's fastest transistor. Their latest device, with a frequency of 509 gigahertz, is 57 gigahertz faster than their previous record holder and could find use in applications such as high-speed communications products, consumer electronics and electronic combat systems.

"The steady rise in the speed of bipolar transistors has relied largely on the vertical scaling of the epitaxial layer structure to reduce the carrier transit time," said Milton Feng, the Holonyak Professor of Electrical and Computer Engineering at Illinois, whose team has been working on high-speed compound semiconductor transistors since 1995. "However, this comes at the cost of increasing the base-collector capacitance. To compensate for this unwanted effect, we have employed lateral scaling of both the emitter and the collector."

Feng and graduate students Walid Hafez and Jie-Wei Lai fabricated the high-speed devices in the university's Micro and Nanotechnology Laboratory. Unlike traditional transistors, which are built from silicon and germanium, the Illinois transistors are made from indium phosphide and indium gallium arsenide.

"This material system is inherently faster than silicon germanium, and can support a much higher current density," Feng said. "By making the components smaller, the transistor can charge and discharge more quickly, creating a significant improvement in speed."

During the past year, high-speed transistor records have fallen like dominoes on the Illinois campus. In January, Feng's group announced a transistor with a 150-nanometer collector and a top frequency of 382 gigahertz. In May, the group reported a 452-gigahertz device with a 25-nanometer base and a 100-nanometer collector. Further scaling reduced the collector size to 75 nanometers, resulting in a 509-gigahertz device, announced last month.

In addition to using a high-speed material system and smaller device components, another technique the researchers employed to boost transistor speed utilized a narrow metal bridge to separate the base terminal from the device connector post.

"Normally in transistors the contact size is bigger than the transistor itself," Feng said. "Our micro-bridge eliminates the parasitic base to collector capacitance that is inherent with designs that use large base contact posts. By isolating the base, we can achieve higher current density and faster device operation."

Faster transistors would enable the creation of faster computers and video games, more flexible and secure wireless communications systems, and more rapid analog-to-digital conversion for use in radar and other electronic combat systems.

"Further vertical scaling of the epitaxial structure, combined with lateral device scaling, should allow devices with even higher frequencies," Feng said. "Our ultimate goal is to make a terahertz transistor."

The Defense Advanced Research Projects Agency funded the work.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Illinois Researchers Create World's Fastest Transistor -- Again." ScienceDaily. ScienceDaily, 10 November 2003. <www.sciencedaily.com/releases/2003/11/031110054910.htm>.
University Of Illinois At Urbana-Champaign. (2003, November 10). Illinois Researchers Create World's Fastest Transistor -- Again. ScienceDaily. Retrieved April 19, 2014 from www.sciencedaily.com/releases/2003/11/031110054910.htm
University Of Illinois At Urbana-Champaign. "Illinois Researchers Create World's Fastest Transistor -- Again." ScienceDaily. www.sciencedaily.com/releases/2003/11/031110054910.htm (accessed April 19, 2014).

Share This



More Matter & Energy News

Saturday, April 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Small Reactors Could Be Future of Nuclear Energy

Small Reactors Could Be Future of Nuclear Energy

AP (Apr. 17, 2014) After the Fukushima nuclear disaster, the industry fell under intense scrutiny. Now, small underground nuclear power plants are being considered as the possible future of the nuclear energy. (April 17) Video provided by AP
Powered by NewsLook.com
Horseless Carriage Introduced at NY Auto Show

Horseless Carriage Introduced at NY Auto Show

AP (Apr. 17, 2014) An electric car that proponents hope will replace horse-drawn carriages in New York City has also been revealed at the auto show. (Apr. 17) Video provided by AP
Powered by NewsLook.com
Honda's New ASIMO Robot, More Human-Like Than Ever

Honda's New ASIMO Robot, More Human-Like Than Ever

AFP (Apr. 17, 2014) It walks and runs, even up and down stairs. It can open a bottle and serve a drink, and politely tries to shake hands with a stranger. Meet the latest ASIMO, Honda's humanoid robot. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com
German Researchers Crack Samsung's Fingerprint Scanner

German Researchers Crack Samsung's Fingerprint Scanner

Newsy (Apr. 16, 2014) German researchers have used a fake fingerprint made from glue to bypass the fingerprint security system on Samsung's new Galaxy S5 smartphone. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins