Featured Research

from universities, journals, and other organizations

Atomically thin ‘switch’ makes for smarter ICT devices in the future

Date:
January 31, 2011
Source:
University of Southampton
Summary:
Researchers have developed a new graphene transistor with 1000 times higher on/off switching ratio.

Researchers at the University of Southampton have developed a new graphene transistor with 1000 times higher on/off switching ratio. A new transistor made from graphene -- the world's thinnest material -- has been developed by a research team at the University of Southampton.

The new transistor achieves a record high-switching performance which will make our future electronic devices -- such as PDAs and computers -- even more functional and high-performance.

In a paper to be published in Electronics Letters on 3 February 2011, Dr Zakaria Moktadir of the Nano research group at the University's School of Electronics and Computer Science (ECS) describes how his research into graphene, a material made from a single atomic layer of carbon, arranged in a two-dimensional honeycomb structure, led to the development of graphene field effect transistors (GFETs) with a unique channel structure at nanoscale.

According to Dr Moktadir, in the context of electronics, graphene could potentially replace or at least be used side by side with silicon integrations.

"CMOS (Silicon Complementary Metal-Oxide- Semiconductor) downscaling is reaching its limits and we need to find a suitable alternative," he said. "Other researchers had looked at graphene as a possibility, but found that one of the drawbacks was that graphene's intrinsic physical properties make it difficult to turn off the current flow."

Dr Moktadir discovered that by introducing geometrical singularities (such as sharp bends and corners) in bilayer graphene nanowires, the current could be turned off efficiently.

According to Professor Hiroshi Mizuta, Head of the Nano group, this engineering approach has achieved an on/off switching ratio 1000 times higher than previous attempts. "Enormous effort has been made across the world to pinch off the channel of GFETs electrostatically, but the existing approaches require either the channel width to be much narrower than 10 nm or a very high voltage to be applied vertically across bilayer graphene layers. This hasn't achieved an on/off ratio which is high enough, and is not viable for practical use."

Dr Moktadir developed this transistor using the new helium ion beam microscope and a focused gallium ion beam system in the Southampton Nanofabrication Centre, which has some of the best nanofabrication facilities in the world.

"This is a breakthrough in the ongoing quest to develop advanced transistors as we progress beyond our current CMOS technology," said Professor Harvey Rutt, Head of the School of Electronics and Computer Science. "It will have major implications for next generation computer, communication and electronic systems. Introducing geometrical singularities into the graphene channel is a new concept which achieves superior performance while keeping the GFET structure simple and therefore commercially exploitable."

Having created the transistor, Dr Moktadir is now undertaking further research to understand the mechanism which causes the current to stop flowing in the channel, testing its reliability and performance under various noise and temperature conditions.


Story Source:

The above story is based on materials provided by University of Southampton. Note: Materials may be edited for content and length.


Cite This Page:

University of Southampton. "Atomically thin ‘switch’ makes for smarter ICT devices in the future." ScienceDaily. ScienceDaily, 31 January 2011. <www.sciencedaily.com/releases/2011/01/110131133532.htm>.
University of Southampton. (2011, January 31). Atomically thin ‘switch’ makes for smarter ICT devices in the future. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2011/01/110131133532.htm
University of Southampton. "Atomically thin ‘switch’ makes for smarter ICT devices in the future." ScienceDaily. www.sciencedaily.com/releases/2011/01/110131133532.htm (accessed September 30, 2014).

Share This



More Matter & Energy News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Do Video Games Trump Brain Training For Cognitive Boosts?

Do Video Games Trump Brain Training For Cognitive Boosts?

Newsy (Sep. 29, 2014) More and more studies are showing positive benefits to playing video games, but the jury is still out on brain training programs. Video provided by Newsy
Powered by NewsLook.com
CERN Celebrates 60 Years of Science

CERN Celebrates 60 Years of Science

Reuters - Business Video Online (Sep. 29, 2014) CERN, the European Organisation for Nuclear Research, celebrates 60 years of bringing nations together through science. As Joanna Partridge reports from inside the famous science centre it's also planning to turn the Large Hadron Collider particle accelerator back on after an upgrade. Video provided by Reuters
Powered by NewsLook.com
This 'Invisibility Cloak' Is Simpler Than Most

This 'Invisibility Cloak' Is Simpler Than Most

Newsy (Sep. 28, 2014) Researchers from the University of Rochester have created a type of invisibility cloak with simple focal lenses. Video provided by Newsy
Powered by NewsLook.com
New Corvette Can Secretly Record Convos And Get You Arrested

New Corvette Can Secretly Record Convos And Get You Arrested

Newsy (Sep. 28, 2014) The 2015 Corvette features valet mode – which allows the owner to secretly record audio and video – but in many states that practice is illegal. 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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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