Navigation Links
Innovation is step toward digital graphene transistors
Date:9/6/2011

WEST LAFAYETTE, Ind. - Researchers are making progress in creating digital transistors using a material called graphene, potentially sidestepping an obstacle thought to dramatically limit the material's use in computers and consumer electronics.

Graphene is a one-atom-thick layer of carbon that conducts electricity with little resistance or heat generation. After its discovery in 2004 - which earned a Nobel Prize in physics - it was touted as a potential replacement for silicon, possibly leading to ultrafast devices with simplified circuits that might be less expensive to manufacture.

However, graphene's luster has dulled in recent years for digital applications as researchers have discovered that it has no "band gap," a trait that is needed to switch on and off, which is critical for digital transistors.

"The fact that graphene is a zero-band-gap material by nature has raised many questions in terms of its usefulness for digital applications," said Purdue doctoral student Hong-Yan Chen.

Electrons in semiconductors like silicon exist at two energy levels, known as the valence and conduction bands. The energy gap between these two levels is called the band gap. Having the proper band gap enables transistors to turn on and off, which allows digital circuits to store information in binary code consisting of sequences of ones and zeroes.

Chen has led a team of researchers in creating a new type of graphene inverter, a critical building block of digital transistors. Other researchers have created graphene inverters, but they had to be operated at 77 degrees Kelvin, which is minus 196 Celsius (minus 320 Fahrenheit).

"If graphene could be used in digital applications, that would be really important," said Chen, who is working with Joerg Appenzeller, a professor of electrical and computer engineering and scientific director of nanoelectronics at Purdue's Birck Nanotechnology Center.

The Purdue researchers are the first to create graphene inverters that work at room temperature and have a gain larger than one, a basic requirement for digital electronics that enables transistors to amplify signals and control its switching from 0 to 1.

Findings were detailed in a paper, "Complementary-Type Graphene Inverters Operating at Room-Temperature," presented in June during the 2011 Device Research Conference in Santa Barbara, Calif.

Thus far graphene transistors have been practical only for specialized applications, such as amplifiers for cell phones and military systems. However, the new inverters represent a step toward learning how to use the material to create graphene transistors for broader digital applications that include computers and consumer electronics.

To create electronic devices, silicon is impregnated with impurities to change its semiconducting properties. Such "doping" is not easily applicable to graphene. However, the researchers have potentially solved this problem by developing "electrostatic doping," which makes it possible for graphene inverters to mimic the characteristics of silicon inverters.

Electrostatic doping is induced through the electric field between metal gates, which are located 40 nanometers away from graphene channels. The doping can be altered by varying the voltage, enabling researchers to test specific doping levels.

"This will allow us to find the sweet spot for operating the device," Chen said.

Further work will be needed to integrate the prototype into a working graphene circuit for digital applications.


'/>"/>

Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert  

Related biology technology :

1. Swedish University Hospital Improves Monitoring of Treatment Efficacy in Multiple Sclerosis With Synthetic MRI Innovation
2. Center for Proteomics at the Translational Genomics Research Institute (TGen) Selected as Waters Center of Innovation
3. From Leadership to Legal Issues, NineSigma Shares Best Practices in an Authoritative Guide to Open Innovation and CrowdSourcing
4. Waters Recognizes Albert J. Fornace Laboratory at Georgetown University Medical Center as a Center of Innovation
5. PleuraFlow Captures Prestigious Innovation Award
6. Leading Life Sciences Luminaries Connect at Innovation Ireland Reception
7. Austen BioInnovation Institute in Akron Begins Work on Roadmap for First U.S. Accountable Care Community
8. Genesis Biosciences Receives Pulire Innovation Award for e card Sanitary Bin Treatment Product
9. Cmed Technology to Preview New Innovations to Speed and Streamline Electronic Trials at DIA Conference
10. Reportlinker Adds Innovations in Protein Kinase Therapies - Significant Proportion of Protein Kinase Pipeline Contains Small Molecule Drugs That Target Oncology
11. Overview of CSL Behring Innovations in Recombinant Technologies Presented at International Conference
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Innovation is step toward digital graphene transistors
(Date:3/24/2017)... Calif. , March 24, 2017   Sienna ... and aesthetics company, today announced that Richard Peterson ... effective March 24.   Peterson, who brings more ... John Smither , who is retiring at the ... in an advisory capacity. Peterson joins Sienna from Novan, ...
(Date:3/23/2017)... Research and Markets has announced the addition of ... offering. ... The Global Market for Bioproducts Should Reach $714.6 Billion ... of 8.9%, This research report quantifies the ... product segments: bio-derived chemicals, biofuels, pharmaceuticals (biodrugs and herbal/botanicals), biocomposite ...
(Date:3/23/2017)...  BioPharmX Corporation (NYSE MKT: BPMX), a specialty ... today reported financial results for the quarter and ... an update on the company,s clinical development efforts ... are pleased to report that last year was ... Anja Krammer. "We achieved key clinical milestones and ...
(Date:3/23/2017)... March 23, 2017 According to a report ... derivatives market is fragmented due to the presence of a large pool ... Thermo Fisher , and Sigma-Aldrich, compete with each other in ... collectively, held more than 76% of this market in 2016.  ... As of now, a ...
Breaking Biology Technology:
(Date:3/22/2017)... 2017 Vigilant Solutions , a vehicle ... agencies, announced today the appointment of retired FBI special ... safety business development. Mr. Sheridan brings more ... a focus on the aviation transportation sector, to his ... Mr. Sheridan served as the Aviation Liaison Agent Coordinator ...
(Date:3/9/2017)... March 9, 2017 4Dx has publicly released ... Imaging Workshop at the University of Pennsylvania. Founder and ... deliver the latest data to world leaders in lung ... together leaders at the forefront of the industry to ... "The quality of the imaging is ...
(Date:3/2/2017)... 2, 2017 Summary This report provides ... its partnering interests and activities since 2010. ... Read the full report: ... since 2010 report provides an in-depth insight into the partnering ... On demand company reports are prepared upon purchase ...
Breaking Biology News(10 mins):