Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Conformal transfer of graphene for reproducible device fabrication

Reliable wafer scale production of graphene devices.
Reliable wafer scale production of graphene devices.

Abstract:
Conformal transfer of graphene on a prepatterned substrate is a viable technology for reproducible fabrication of graphene devices. Such is the conclusion of a recent study by a team of scientists from Germany, the Netherlands, Spain and Saudi Arabia.

Conformal transfer of graphene for reproducible device fabrication

San Sebastian, Spain | Posted on August 11th, 2015

Reliable fabrication of graphene devices for electronics has been a technological challenge for the graphene community for years. Large area high quality graphene, required for high-tech applications, is typically grown by chemical vapor deposition (CVD) on metal foils. Following growth, the graphene film is transferred to an electronically useful substrate, which is commonly SiO2 on Si. Standard procedure follows these steps up with photolithographic patterning of devices and evaporation of gold contacts.

In the past, this sequence of steps failed to result in devices of consistently high quality, as each fabrication step introduced unpredictable defects. The film growth was the first step to be perfected by a global network of busy scientists. Graphene transfer was in parallel mastered by the Spanish company Graphenea, a participant of this most recent breakthrough, as evidenced by their patent award earlier this year. Still, lithography and evaporation would cause film breaks, cracks and wrinkles, which were unpredictable and which lowered the quality of the final devices. Now, researchers have turned the fabrication upside down by performing lithography and contact evaporation prior to graphene transfer. The result is a reliable method for wafer-scale fabrication of graphene devices.

The paper, recently published in Applied Materials & Interfaces (a publication of the American Chemical Society), starts by considering the values reported in literature for contact and sheet resistance obtained with the standard graphene fabrication and transfer method. Focusing on graphene grown by CVD, the researchers find that there is significant scatter in the reported values, spanning nearly an order of magnitude. The scientists then performed the standard procedure themselves, finding that the resulting graphene sheet is inhomogeneous, with defects appearing in random places.

Following the improved process, in which the contact patterning and metal deposition are performed prior to the transfer, yields a much better result. The graphene sheet is smooth and uniform across the wafer, conformally covering the electrode structures. Electrical measurements indicate good device reproducibility, with sheet resistance low enough to consider using these graphene devices in radio frequency electronics. The potential application of the graphene channels is additionally confirmed by steady device performance over a wide range of applied current, up to 0.5 A. The careful fabrication led to devices that support the highest current density ever reported in transferred CVD graphene.

Over 600 devices were tested, showing a very narrow spread in the measured parameters. Such statistical similarity not only opens a gate to mass production of graphene devices for radio frequency applications, but immediately allows the testing of fundamental device physics of monolayer materials.

####

For more information, please click here

Contacts:
Headquarters
Graphenea
Avenida de Tolosa, 76
20018 - Donostia/San Sebastián
Spain

Copyright © Graphenea Inc.

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

Graphene/ Graphite

You're not so tough, h-BN: Rice University chemists find new path to make strong 2D material better for applications August 14th, 2019

A modified device fabrication process achieves enhanced spin transport in graphene August 6th, 2019

Physicists make graphene discovery that could help develop superconductors: Rutgers-led research could reduce energy use, improve electronic devices August 1st, 2019

Oddball edge wins nanotube faceoff: Rice U. theory shows peculiar 'Janus' interface a common mechanism in carbon nanotube growth July 29th, 2019

Chip Technology

ULVAC Launches Revolutionary PZT Piezoelectric Thin-film Process Technology and HVM Solution for MEMS Sensors/Actuators: Enabling Reliable, High-quality Film Production for Next Generation Devices August 16th, 2019

Toppan Photomasks and GLOBALFOUNDRIES Enter into Multi-Year Supply Agreement August 15th, 2019

Sharp meets flat in tunable 2D material: Rice's new atom-flat compounds show promise for optoelectronics, advanced computing August 12th, 2019

New synthesis method opens up possibilities for organic electronics August 7th, 2019

Discoveries

uSEE breakthrough unlocks the nanoscale world on standard biology lab equipment August 16th, 2019

Optofluidic chip with nanopore 'smart gate' developed for single molecule analysis: Programmable device enables on-demand delivery of individual biomolecules with feedback-controlled gating for high-throughput analysis August 16th, 2019

Probing the Origin of Alzheimer’s . . . with Transistors: Novel high-sensitivity detector could aid in early diagnosis August 15th, 2019

Damaged hearts rewired with nanotube fibers: Texas Heart doctors confirm Rice-made, conductive carbon threads are electrical bridges August 14th, 2019

Materials/Metamaterials

You're not so tough, h-BN: Rice University chemists find new path to make strong 2D material better for applications August 14th, 2019

A modified device fabrication process achieves enhanced spin transport in graphene August 6th, 2019

Rice lab produces simple fluorescent surfactants: Compounds show promise for use in medicine, manufacturing August 5th, 2019

Wood You Like Some Fresh Water? New treatment for wood makes a membrane to extract fresh water August 5th, 2019

Announcements

uSEE breakthrough unlocks the nanoscale world on standard biology lab equipment August 16th, 2019

Optofluidic chip with nanopore 'smart gate' developed for single molecule analysis: Programmable device enables on-demand delivery of individual biomolecules with feedback-controlled gating for high-throughput analysis August 16th, 2019

ULVAC Launches Revolutionary PZT Piezoelectric Thin-film Process Technology and HVM Solution for MEMS Sensors/Actuators: Enabling Reliable, High-quality Film Production for Next Generation Devices August 16th, 2019

RIT to upgrade Semiconductor and Microsystems Fabrication Laboratory through $1 million state grant: Upgrades to clean room will enhance university’s research capabilities in photonics, quantum technologies and smart systems August 16th, 2019

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

uSEE breakthrough unlocks the nanoscale world on standard biology lab equipment August 16th, 2019

Optofluidic chip with nanopore 'smart gate' developed for single molecule analysis: Programmable device enables on-demand delivery of individual biomolecules with feedback-controlled gating for high-throughput analysis August 16th, 2019

Probing the Origin of Alzheimer’s . . . with Transistors: Novel high-sensitivity detector could aid in early diagnosis August 15th, 2019

Damaged hearts rewired with nanotube fibers: Texas Heart doctors confirm Rice-made, conductive carbon threads are electrical bridges August 14th, 2019

Patents/IP/Tech Transfer/Licensing

Sheaths drive powerful new artificial muscles July 11th, 2019

'Hot spots' increase efficiency of solar desalination: Rice University engineers boost output of solar desalination system by 50% June 19th, 2019

Magnetoresistive sensors for near future innovative development March 22nd, 2019

Organic semiconductors: One transistor for all purposes March 22nd, 2019

Research partnerships

Optofluidic chip with nanopore 'smart gate' developed for single molecule analysis: Programmable device enables on-demand delivery of individual biomolecules with feedback-controlled gating for high-throughput analysis August 16th, 2019

Damaged hearts rewired with nanotube fibers: Texas Heart doctors confirm Rice-made, conductive carbon threads are electrical bridges August 14th, 2019

Nanoparticles’ movement reveals whether they can successfully target cancer: Targeting nanoparticles rotate faster and move across larger areas August 9th, 2019

Researchers embrace imperfection to improve biomolecule transport August 8th, 2019

New-Contracts/Sales/Customers

Toppan Photomasks and GLOBALFOUNDRIES Enter into Multi-Year Supply Agreement August 15th, 2019

180 Degree Capital Corp.’s Portfolio Company, TheStreet, Inc., Enters into Agreement to be Acquired by TheMaven, Inc. for $16.5 Million June 13th, 2019

Analog Bits and GLOBALFOUNDRIES Deliver Differentiated Analog and Mixed Signal IP for High-Performance Mobile and Compute Applications: Analog Bits’ Analog and Mixed Signal IPs Including Various PLLs, PCIe Reference Clock, Sensors and Power Circuits with GLOBALFOUNDRIES 12nm Fin June 5th, 2019

Successful installation of the first Photonic Professional GT2 at KEIO University in Japan May 16th, 2019

RFID

Nanowire 'inks' enable paper-based printable electronics: Highly conductive films make functional circuits without adding high heat January 4th, 2017

GLOBALFOUNDRIES Launches Industry’s First 22nm FD-SOI Technology Platform: 22FDX offers the best combination of performance, power consumption and cost for IoT, mainstream mobile, RF connectivity, and networking July 13th, 2015

New micro-supercapacitor structure inspired by the intricate design of leaves: A team of scientists in Korea has devised a new method for making a graphene film for supercapacitors July 2nd, 2015

Designer electronics out of the printer: Optimized printing process enables custom organic electronics June 16th, 2015

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project