Tuesday, August 04, 2015
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
New PC Accessories For Windows 10
Xbox Unveils New Game Lineup
Nero TuneItUp Gets Windows-based PCs Back In Shape
Seagate Micron Alliance Introduce New SAS Solid State Drive
SanDisk and SK Hynix Expanded IP and Commercial Relationship
WD and 20th Century Fox Partner to Offer 4K UHD Movies
Toshiba Announces Third Generation of Enterprise SAS SSDs, Starts Production Of 3D NAND
Xiaomi Has Reclaimed Top Spot in China, Huawei Pushes Ahead of Apple
Active Discussions
How to back up a PS2 DL game
Copy a protected DVD?
roxio issues with xp pro
How to burn a backup copy of The Frozen Throne
Help make DVDInfoPro better with dvdinfomantis!!!
Copied dvd's say blank in computer only
menu making
Optiarc AD-7260S review
 Home > News > General Computing > Researc...
Last 7 Days News : SU MO TU WE TH FR SA All News

Monday, October 29, 2012
Researchers Bring Commercial Fabrication of Carbon Nanotubes Closer


IBM scientists have demonstrated a new approach to carbon nanotechnology that opens up the path for commercial fabrication of smaller, faster and more powerful computer chips.

For the first time, more than ten thousand working transistors made of nano-sized tubes of carbon have been precisely placed and tested in a single chip using standard semiconductor processes. These carbon devices are poised to replace and outperform silicon technology allowing further miniaturization of computing components and leading the way for future microelectronics.

Silicon microprocessor technology has continually shrunk in size and improved in performance, thereby driving the information technology revolution. Silicon transistors, tiny switches that carry information on a chip, have been made smaller year after year, but they are approaching a point of physical limitation. Their increasingly small dimensions, now reaching the nanoscale, will prohibit any gains in performance due to the nature of silicon and the laws of physics. Within a few more generations, classical scaling and shrinkage will no longer yield the sizable benefits of lower power, lower cost and higher speed processors that the industry has become accustomed to.

Carbon nanotubes represent a new class of semiconductor materials whose electrical properties are more attractive than silicon, particularly for building nanoscale transistor devices that are a few tens of atoms across. Electrons in carbon transistors can move easier than in silicon-based devices allowing for quicker transport of data. The nanotubes are also ideally shaped for transistors at the atomic scale, an advantage over silicon. These qualities are among the reasons to replace the traditional silicon transistor with carbon - and coupled with new chip design architectures - will allow computing innovation on a miniature scale for the future.

The approach developed at IBM labs paves the way for circuit fabrication with large numbers of carbon nanotube transistors at predetermined substrate positions. The ability to isolate semiconducting nanotubes and place a high density of carbon devices on a wafer is crucial to assess their suitability for a technology - eventually more than one billion transistors will be needed for future integration into commercial chips. Until now, scientists have been able to place at most a few hundred carbon nanotube devices at a time, not nearly enough to address key issues for commercial applications.

"Carbon nanotubes, borne out of chemistry, have largely been laboratory curiosities as far as microelectronic applications are concerned. We are attempting the first steps towards a technology by fabricating carbon nanotube transistors within a conventional wafer fabrication infrastructure," said Supratik Guha, Director of Physical Sciences at IBM Research. "The motivation to work on carbon nanotube transistors is that at extremely small nanoscale dimensions, they outperform transistors made from any other material. However, there are challenges to address such as ultra high purity of the carbon nanotubes and deliberate placement at the nanoscale. We have been making significant strides in both."

Originally studied for the physics that arises from their atomic dimensions and shapes, carbon nanotubes are being explored by scientists worldwide in applications that span integrated circuits, energy storage and conversion, biomedical sensing and DNA sequencing.

Carbon, a readily available basic element from which crystals as hard as diamonds and as soft as the "lead" in a pencil are made, has wide-ranging IT applications. Carbon nanotubes are single atomic sheets of carbon rolled up into a tube. The carbon nanotube forms the core of a transistor device that will work in a fashion similar to the current silicon transistor, but will be better performing. They could be used to replace the transistors in chips that power our data-crunching servers, high performing computers and ultra fast smart phones.

Earlier this year, IBM researchers demonstrated carbon nanotube transistors can operate as excellent switches at molecular dimensions of less than ten nanometers - the equivalent to 10,000 times thinner than a strand of human hair and less than half the size of the leading silicon technology. Comprehensive modeling of the electronic circuits suggests that about a five to ten times improvement in performance compared to silicon circuits is possible.

There are practical challenges for carbon nanotubes to become a commercial technology notably, as mentioned earlier, due to the purity and placement of the devices. Carbon nanotubes naturally come as a mix of metallic and semiconducting species and need to be placed perfectly on the wafer surface to make electronic circuits. For device operation, only the semiconducting kind of tubes is useful which requires essentially complete removal of the metallic ones to prevent errors in circuits. Also, for large scale integration to happen, it is critical to be able to control the alignment and the location of carbon nanotube devices on a substrate.

To overcome these barriers, IBM researchers developed a method based on ion-exchange chemistry that allows precise and controlled placement of aligned carbon nanotubes on a substrate at a high density - two orders of magnitude greater than previous experiments, enabling the controlled placement of individual nanotubes with a density of about a billion per square centimeter.

The process starts with carbon nanotubes mixed with a surfactant, a kind of soap that makes them soluble in water. A substrate is comprised of two oxides with trenches made of chemically-modified hafnium oxide (HfO2) and the rest of silicon oxide (SiO2). The substrate gets immersed in the carbon nanotube solution and the nanotubes attach via a chemical bond to the HfO2 regions while the rest of the surface remains clean.

By combining chemistry, processing and engineering expertise, IBM researchers are able to fabricate more than ten thousand transistors on a single chip.

Furthermore, rapid testing of thousands of devices is possible using high volume characterization tools due to compatibility to standard commercial processes.

As this new placement technique can be readily implemented, involving common chemicals and existing semiconductor fabrication, it will allow the industry to work with carbon nanotubes at a greater scale and deliver further innovation for carbon electronics.

This achievement was published today in the peer-reviewed journal Nature Nanotechnology.


Previous
Next
Pioneer And Otsuka Medical Devices To Work On New Medical Endoscope Technology        All News        New Kingmax mSATA MMP30 SSD Targets Ultrabooks, Tablets
Pioneer And Otsuka Medical Devices To Work On New Medical Endoscope Technology     General Computing News      Google Postpones Monday Event Over Hurricane Worries

Get RSS feed Easy Print E-Mail this Message

Related News
IBM Acquires Compose to Expand Cloud Data Services
IBM Revenue Declines
IBM Develops 7nm Processor
IBM and Box Partner to Transform Work in the Cloud
IBM Maintains Top Position In The List Of U.S. Patents
IBM Buys Blue Box to Accelerate Open Hybrid Clouds
IBM Scientists Achieve Critical Steps to Building First Quantum Computer
IBM Revenue Falls In Q1
IBM Opens Threat Intelligence to Combat Cyber Attacks
IBM Announces Partnerships to Transform Personal Health with Watson and Open Cloud
IBM Sets New Record for Tape Storage
IBM and China Telecom Partner to Accelerate Mobile Enterprise Adoption in China

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2015 - All rights reserved -
Privacy policy - Contact Us .