Graphene is a 2-dimensional layer of tightly bound carbon atoms arranged in hexagonal arrays. Sheets of graphene are the building blocks of graphite. Due to its phenomenal electronic properties, graphene has been considered as a leading material for next generation electronic devices in the multibillion dollar semiconductor industry.
Using a process called silicon sublimation, EOC researchers David Snyder and Randy Cavalero thermally processed silicon carbide wafers in a physical vapor transport furnace until the silicon migrated away from the surface, leaving behind a layer of carbon that formed into a one- to two-atom-thick film of graphene on the wafer surface. Achieving 100mm graphene wafers has put the Penn State EOC in a leading position for the synthesis of ultra-large graphene and graphene-based devices.
With the support of the Naval Surface Warfare Center, EOC researchers are initially focusing on graphene materials to improve the transistor performance in various radio frequency (RF) applications. According to EOC materials scientist Joshua Robinson, Penn State is developing graphene device processing to enhance graphene transistor performance and has fabricated RF field effect transistors on 100mm graphene wafers.
Another goal of the Penn State researchers is to improve the electron mobility of the Si-sublimated wafers to nearer the theoretical limit, approximately 100 times faster than silicon. That will require improvements in the material quality and device design, says Robinson, but there is significant room for improvements in growth and processing, he believes.
In addition to silicon sublimation, EOC researchers Joshua Robinson, Mark Fanton, Brian Weiland, Kathleen Trumbull, and Michael LaBella are developing the synthesis and device fabrication of graphene on silicon using a non-sublimation route as a means to achieve wafer diameters exceeding 200mm, a necessity for integrating graphene into the existing semiconductor industry. Graphene has the potential to enable terahertz computing at processor speeds 100 to 1000 times faster than silicon.
First discovered in 2004, graphene is now being studied worldwide for electronics, displays, solar cells, sensors, and hydrogen storage. With its remarkable physical, chemical, and structural properties, graphene promises to become a key material for 21st century technology.
The Materials Research Institute coordinates the research of more than 200 materials scientists at Penn State. The Millennium Science Complex, now under construction, is a $225M facility for materials and life sciences research scheduled to open at University Park in summer 2011. Visit MRI on the Web at www.mri.psu.edu.
EOC Contact: Joshua Robinson, Ph.D., email@example.com
Joshua Robinson | Newswise Science News
New value added to the ICSD (Inorganic Crystal Structure Database)
27.03.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
Argon is not the 'dope' for metallic hydrogen
24.03.2017 | Carnegie Institution for Science
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
27.03.2017 | Earth Sciences
27.03.2017 | Life Sciences
27.03.2017 | Life Sciences