Navigation Links
Move over, silicon: Advances pave way for powerful carbon-based electronics

Bypassing decades-old conventions in making computer chips, Princeton engineers developed a novel way to replace silicon with carbon on large surfaces, clearing the way for new generations of faster, more powerful cell phones, computers and other electronics.

The electronics industry has pushed the capabilities of silicon -- the material at the heart of all computer chips -- to its limit, and one intriguing replacement has been carbon, said Stephen Chou, professor of electrical engineering. A material called graphene -- a single layer of carbon atoms arranged in a honeycomb lattice -- could allow electronics to process information and produce radio transmissions 10 times better than silicon-based devices.

Until now, however, switching from silicon to carbon has not been possible because technologists believed they needed graphene material in the same form as the silicon used to make chips: a single crystal of material eight or 12-inches wide. The largest single-crystal graphene sheets made to date have been no wider than a couple millimeters, not big enough for a single chip. Chou and researchers in his lab realized that a big graphene wafer is not necessary, as long they could place small crystals of graphene only in the active areas of the chip. They developed a novel method to achieve this goal and demonstrated it by making high-performance working graphene transistors.

Our approach is to completely abandon the classical methods that industry has been using for silicon integrated circuits, Chou said.

Chou, along with graduate student Xiaogan Liang and materials engineer Zengli Fu, published their findings in the December 2007 issue of Nano Letters, a leading journal in the field. The research was funded in part by the Office of Naval Research.

In their new method, the researchers make a special stamp consisting of an array of tiny flat-topped pillars, each one-tenth of a millimeter wide. They press the pillars against a block of graphite (pure carbon), cutting thin carbon sheets, which stick to the pillars. The stamp is then removed, peeling away a few atomic layers of graphene. Finally, the stamp is aligned with and pressed against a larger wafer, leaving the patches of graphene precisely where transistors will be built.

The technique is like printing, Chou said. By repeating the process and using variously shaped stamps (the researchers also made strips instead of round pillars), all the active areas for transistors are covered with single crystals of graphene.

Previously, scientists have been able to peel graphene sheets from graphite blocks, but they had no control over the size and location of the pieces when placing them on a surface, Chou said.

One innovation that made the technique possible was to coat the stamp with a special material that sticks to carbon when it is cold and releases when it is warm, allowing the same stamp to pick up and release the graphene.

Chous lab took the next step and built transistors -- tiny on-off switches -- on their printed graphene crystals. Their transistors displayed high performance; they were more than 10 times faster than silicon transistors in moving "electronic holes" -- a key measure of speed.

The new technology could find almost immediate use in radio electronics, such as cell phones and other wireless devices that require high power output, Chou said. Depending on the level of interest from industry, the technique could be applied to wireless communication devices within a few years, Chou predicted.

What we have done is shown that this approach is possible; the next step is to scale it up, Chou said.


Contact: Steven Schultz
Princeton University, Engineering School  

Related biology technology :

1. NovaQuest Advances Virtual Development Model With Strategic Investment in TOPIGEN Pharmaceuticals
2. Lorus Advances Clinical Development of GTI-2040 Combined with Ara-C in Acute Myeloid Leukemia
3. Verenium Advances Its Development Work With Cargill on a New Food-Related Product
4. EpiCept to Present Pre-clinical Advances of Myc Oncogene Directed Drug Discovery at Assays and Cellular Targets Conference
5. Response Genetics CEO to Discuss Advances in Optimizing Therapy through Pharmacogenomics as Part of a Series of Presentations at AACR-NCI-EORTC International Conference
6. Anavex advances drug candidate for treatment of Alzheimers disease
7. The sensitive side of carbon nanotubes: Creating powerful pressure sensors
8. BioElectronics Corporation Announces Singapore and Malaysia Sales
9. Rice, Nanyang Tech collaborate on sustainable nanoelectronics
10. Nanotube forests grown on silicon chips for future computers, electronics
11. BioElectronics Corporation Announces Distribution Agreement With TSS Medical of Italy
Post Your Comments:
Related Image:
Move over, silicon: Advances pave way for powerful carbon-based electronics
(Date:11/24/2015)... Israel , Nov. 24, 2015  Tikcro Technologies Ltd. (OTCQB: TIKRF) ... on December 29, 2015 at 11:00 a.m. Israel ... Electra Tower, 98 Yigal Allon Street, 36 th Floor, ... of Eric Paneth and Izhak Tamir to the ... Rami Skaliter as external directors; , approval of an amendment to ...
(Date:11/24/2015)... , Nov. 24, 2015  Twist Bioscience, ... that Emily Leproust, Ph.D., Twist Bioscience chief executive ... Healthcare Conference on December 1, 2015 at 3:10 ... in New York City. --> ... . Twist Bioscience is on Twitter. Sign ...
(Date:11/24/2015)... ... , ... InSphero AG, the leading supplier of easy-to-use solutions for production, culture, ... serve as Chief Operating Officer. , Having joined InSphero in November 2013 ... was promoted to Head of InSphero Diagnostics in 2014. There she has built ...
(Date:11/24/2015)... Nov. 24, 2015 /CNW Telbec/ - ProMetic Life Sciences Inc. ... that Mr. Pierre Laurin , President and Chief Executive ... the upcoming Piper Jaffray 27 th Annual Healthcare Conference ... December 1-2, 2015. st , at 8.50am ... meetings throughout the day. The presentation will be available live ...
Breaking Biology Technology:
(Date:10/29/2015)... , Oct. 29, 2015   MedNet Solutions ... the entire spectrum of clinical research, is pleased to ... High Tech Association (MHTA) as one of only three ... the "Software – Small and Growing" category. The Tekne Awards ... who have shown superior technology innovation and leadership. ...
(Date:10/29/2015)... 2015  Connected health pioneer, Joseph C. Kvedar ... technology-enabled health and wellness, and the business opportunities that ... The Internet of Healthy Things . Long before ... existed, Dr. Kvedar, vice president, Connected Health, Partners HealthCare, ... moving care from the hospital or doctor,s office into ...
(Date:10/27/2015)... October 27, 2015 Munich, ... Gaze Mapping technology (ASGM) automatically maps data from mobile ... Glasses , so that they can be quantitatively ... Munich, Germany , October 28-29, 2015. ... data from mobile eye tracking videos created with ...
Breaking Biology News(10 mins):