Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Building microchips from the bottom up-- MIT develops novel self-assembly method that could break size barrier

Abstract:
Using a novel system based on molecules that can assemble themselves into precise patterns, MIT researchers have come up with a way of beating size limitations that would otherwise crimp improvements in data-storage media and electronic microchips.

Building microchips from the bottom up-- MIT develops novel self-assembly method that could break size barrier

Cambridge, MA | Posted on August 14th, 2008

Such self-assembling molecular systems, called block copolymers, have been known for many years, but the problem was that the regular patterns they produced were well-ordered only over very small areas. The MIT researchers found a way to combine this self-assembly with conventional lithographic chip-making technology, so that the lithographic patterns provide a set of "anchors" to hold the structure in place, while the self-assembling molecules fill in the fine detail between the anchors.

The work, carried out by three MIT professors and three graduate students, is being reported this week in the journal Science.

Karl Berggren, the Emanuel E. Landsman Associate Professor of Electrical Engineering in MIT's Department of Electrical Engineering and Computer Science, explains that without the lithographed "pillars" to anchor the pattern, the self-assembling molecules "would be a mess of randomly arranged lattices." But with the pillars, "the block copolymer lattice is sort of fooled by these pillars, and forms its array around them. They form a nice, ordered pattern around the pillars."

Edwin L. Thomas, Morris Cohen Professor of Materials Science and Engineering and head of the department, who is also a co-author of the paper, says that the original inspiration for the whole concept came from a graduate student, Ion Bita, who now works for Qualcomm in California. Bita explains that "by properly choosing the spatial distribution of the pillars to match a desired final structure, it was possible to consistently generate defect-free polymer nanostructures."

The molecules themselves are made from a pair of polymer chains that are bonded together. The chains are chemically different, like oil and water, and do not mix. As a result, when spread on a surface they naturally separate into an orderly array, forming a pattern of tiny balls, each about 20 nanometers across. By using similar molecules with shorter chains, the resulting structures could be made even smaller, says Caroline Ross, Toyota Professor in MIT's Department of Materials Science and Engineering.

"Nature allows you to get these really well-ordered structures without doing much work," because of the way the molecules assemble themselves, Ross says. "It sort of magically forms these structures."

By changing the spacing of the pillars they create on the chip surface, the new method makes it possible to control the size and spacing of the overall pattern, Berggren says. The pillars themselves are placed on the surface using advanced high-resolution electron-beam lithography methods that have also been developed at MIT.

The most immediate application will be for improving the storage capacity of magnetic storage systems such as the hard disk drives used in computers, he says. For that application, the new method could be tested within the next year or two, he says. "The state of the industry in magnetic media is really ready for this," Berggren says. "They really need something right now."

In the future, by creating more complex patterns in the lithographic part of the process, entire computer chips could be made this way, says Ross. "The ultimate goal would be a complete self-assembling chip structure," she says. The lithographic step, instead of just a regular grid of dots as in the present system, could produce a more complex pattern of dots, lines and junctions, with the block copolymers then filling in the patterns between them.

"Ultimately, this is a technology that is very high-resolution and very scalable," Berggren says. It could also be used for other kinds of devices, including energy technology applications such as electrodes for fuel cells.

MIT graduate students Joel Yang and Yeon Sik Jung also worked on the project. It was funded by the National Science Foundation, the Semiconductor Research Corp., the Nanoelectronics Research Initiative, King Abdulaziz City for Science and Technology and Alfaisal University, and the Singapore-MIT Alliance.

By David Chandler, MIT News Office

####

About MIT
The mission of MIT is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.

For more information, please click here

Contacts:
Teresa Herbert
Media Specialist
Massachusetts Institute of Technology
News Office, Room 11-400
Cambridge, MA 02139-4307
Phone: 617-258-5403
Fax: 617-258-8762

Copyright © MIT

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Chip Technology

A metal that behaves like water: Researchers describe new behaviors of graphene February 12th, 2016

Silicon chip with integrated laser: Light from a nanowire: Nanolaser for information technology February 12th, 2016

Research reveals carbon films can give microchips energy storage capability: International team from Drexel University and Paul Sabatier University reveals versatility of carbon films February 11th, 2016

New thin film transistor may lead to flexible devices: Researchers engineer an electronics first, opening door to flexible electronics February 10th, 2016

Self Assembly

New type of nanowires, built with natural gas heating: UNIST research team developed a new simple nanowire manufacturing technique February 1st, 2016

Researchers develop completely new kind of polymer: Hybrid polymers could lead to new concepts in self-repairing materials, drug delivery and artificial muscles January 30th, 2016

Polymer nanowires that assemble in perpendicular layers could offer route to tinier chip components January 23rd, 2016

Nanodevice, build thyself: Researchers in Germany studied how a multitude of electronic interactions govern the encounter between a molecule called porphine and copper and silver surfaces January 18th, 2016

Discoveries

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Announcements

Graphene leans on glass to advance electronics: Scientists' use of common glass to optimize graphene's electronic properties could improve technologies from flat screens to solar cells February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic