Navigation Links
UCLA chemists, engineers achieve world record with high-speed graphene transistors
Date:9/4/2010

Graphene, a one-atom-thick layer of graphitic carbon, has great potential to make electronic devices such as radios, computers and phones faster and smaller. But its unique properties have also led to difficulties in integrating the material into such devices.

In a paper published Sept. 1 in the journal Nature, a group of UCLA researchers demonstrate how they have overcome some of these difficulties to fabricate the fastest graphene transistor to date.

With the highest known carrier mobility the speed at which electronic information is transmitted by a material graphene is a good candidate for high-speed radio-frequency electronics. But traditional techniques for fabricating the material often lead to deteriorations in device quality.

The UCLA team, led by professor of chemistry and biochemistry Xiangfeng Duan, has developed a new fabrication process for graphene transistors using a nanowire as the self-aligned gate.

Self-aligned gates are a key element in modern transistors, which are semiconductor devices used to amplify and switch electronic signals. Gates are used to switch the transistor between various states, and self-aligned gates were developed to deal with problems of misalignment encountered because of the shrinking scale of electronics.

To develop the new fabrication technique, Duan teamed with two other researchers from the California NanoSystems Institute at UCLA, Yu Huang, an assistant professor of materials science and engineering at the Henry Samueli School of Engineering and Applied Sciences, and Kang Wang, a professor of electrical engineering at the Samueli School.

"This new strategy overcomes two limitations previously encountered in graphene transistors," Duan said. "First, it doesn't produce any appreciable defects in the graphene during fabrication, so the high carrier mobility is retained. Second, by using a self-aligned approach with a nanowire as the gate, the group was able to overcome alignment difficulties previously encountered and fabricate very short-channel devices with unprecedented performance."

These advances allowed the team to demonstrate the highest speed graphene transistors to date, with a cutoff frequency up to 300 GHz comparable to the very best transistors from high-electron mobility materials such gallium arsenide or indium phosphide.

"We are very excited about our approach and the results, and we are currently taking additional efforts to scale up the approach and further boost the speed." said Lei Liao, a postdoctoral fellow at UCLA.

High-speed radio-frequency electronics may also find wide applications in microwave communication, imaging and radar technologies.


'/>"/>

Contact: Mike Rodewald
mrodewald@cnsi.ucla.edu
310-267-5883
University of California - Los Angeles
Source:Eurekalert

Related biology technology :

1. Inspired by a cotton candy machine, engineers put a new spin on creating tiny nanofibers
2. Engineers produce how-to guide for controlling the structure of nanoparticles
3. Capping a two-faced particle gives duke engineers complete control
4. UCR physicist receives highest honor US government gives young scientists or engineers
5. Connecting Materials Science With Biology, K-State Engineers Create DNA Sensors That Could Identify Cancer Using Material Only One Atom Thick
6. Siemens Offers Life Science Solutions Design Guide for Consulting Engineers
7. UB engineers prove that carbon nanotubes are superior to metals for electronics
8. Engineers tune a nanoscale grating structure to trap and release a variety of light waves
9. New Educational Website Celebrates the Accomplishments of Engineers
10. Virginia Tech engineers investigate energy independent monitoring system for bridges
11. Techstreet Launches BuildingBlocks Utility for Industry Standards Saving Time and Increasing Productivity for Engineers
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/4/2016)...  In five studies being presented today during the ... Exposition in San Diego , researchers ... delivery of life-saving treatments to patients with a variety ... carry therapies directly to the sites in the body ... substantial advantage over traditional, systemic methods. The studies highlight ...
(Date:12/2/2016)... ... December 02, 2016 , ... In anticipation of AxioMed’s exclusive ... production, company President, Jake Lubinski will be traveling to Switzerland from December 5-10. ... Bern, Lucerne, and Zurich to discuss the benefits of a viscoelastic disc. AxioMed ...
(Date:12/2/2016)... Conn. , Dec. 2, 2016  The Multiple ... presentations from the MMRF CoMMpass Study SM —the largest ... accelerating precision medicine in multiple myeloma—will be presented at ... Annual Meeting & Exposition in San Diego ... helping to optimize treatment strategies, as well as identify ...
(Date:12/2/2016)... 2, 2016 CytRx Corporation (NASDAQ: ... in oncology, today announced the appointment of Earl ... consultant, and private healthcare investor, to its Board of ... with clinical and strategic experience at the highest level," ... CEO. "As one of the world,s leading orthopedic surgeons, ...
Breaking Biology Technology:
(Date:6/22/2016)... On Monday, the Department of Homeland Security (DHS) issued ... the Biometric Exit Program. The Request for Information (RFI), ... that CBP intends to add biometrics to confirm when ... , in order to deter visa overstays, to ... Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/16/2016)... , June 16, 2016 ... is expected to reach USD 1.83 billion by ... View Research, Inc. Technological proliferation and increasing demand ... are expected to drive the market growth. ... The development of advanced multimodal techniques ...
(Date:6/9/2016)... June 9, 2016 Paris ... Teleste,s video security solution to ensure the safety of people ... during the major tournament Teleste, an international ... and services, announced today that its video security solution will ... to back up public safety across the country. The system ...
Breaking Biology News(10 mins):