Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



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

First human trial shows ‘wonder’ material can be developed safely: A revolutionary nanomaterial with huge potential to tackle multiple global challenges could be developed further without acute risk to human health, research suggests February 16th, 2024

NRL discovers two-dimensional waveguides February 16th, 2024

$900,000 awarded to optimize graphene energy harvesting devices: The WoodNext Foundation's commitment to U of A physicist Paul Thibado will be used to develop sensor systems compatible with six different power sources January 12th, 2024

First direct imaging of small noble gas clusters at room temperature: Novel opportunities in quantum technology and condensed matter physics opened by noble gas atoms confined between graphene layers January 12th, 2024

Chip Technology

New chip opens door to AI computing at light speed February 16th, 2024

HKUST researchers develop new integration technique for efficient coupling of III-V and silicon February 16th, 2024

Electrons screen against conductivity-killer in organic semiconductors: The discovery is the first step towards creating effective organic semiconductors, which use significantly less water and energy, and produce far less waste than their inorganic counterparts February 16th, 2024

NRL discovers two-dimensional waveguides February 16th, 2024

Discoveries

What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024

Researchers’ approach may protect quantum computers from attacks March 8th, 2024

High-tech 'paint' could spare patients repeated surgeries March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Materials/Metamaterials/Magnetoresistance

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Focused ion beam technology: A single tool for a wide range of applications January 12th, 2024

Catalytic combo converts CO2 to solid carbon nanofibers: Tandem electrocatalytic-thermocatalytic conversion could help offset emissions of potent greenhouse gas by locking carbon away in a useful material January 12th, 2024

Announcements

What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024

Curcumin nanoemulsion is tested for treatment of intestinal inflammation: A formulation developed by Brazilian researchers proved effective in tests involving mice March 8th, 2024

The Access to Advanced Health Institute receives up to $12.7 million to develop novel nanoalum adjuvant formulation for better protection against tuberculosis and pandemic influenza March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

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

Researchers develop artificial building blocks of life March 8th, 2024

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

Curcumin nanoemulsion is tested for treatment of intestinal inflammation: A formulation developed by Brazilian researchers proved effective in tests involving mice March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Patents/IP/Tech Transfer/Licensing

Getting drugs across the blood-brain barrier using nanoparticles March 3rd, 2023

Study finds nanomedicine targeting lymph nodes key to triple negative breast cancer treatment: In mice, nanomedicine can remodel the immune microenvironment in lymph node and tumor tissue for long-term remission and lung tumor elimination in this form of metastasized breast cance May 13th, 2022

Metasurfaces control polarized light at will: New research unlocks the hidden potential of metasurfaces August 13th, 2021

Arrowhead Pharmaceuticals Announces Closing of Agreement with Takeda November 27th, 2020

Research partnerships

Researchers’ approach may protect quantum computers from attacks March 8th, 2024

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

'Sudden death' of quantum fluctuations defies current theories of superconductivity: Study challenges the conventional wisdom of superconducting quantum transitions January 12th, 2024

Development of zinc oxide nanopagoda array photoelectrode: photoelectrochemical water-splitting hydrogen production January 12th, 2024

New-Contracts/Sales/Customers

Bruker Light-Sheet Microscopes at Major Comprehensive Cancer Center: New Advanced Imaging Center Powered by Two MuVi and LCS SPIM Microscopes March 25th, 2021

Arrowhead Pharmaceuticals Announces Closing of Agreement with Takeda November 27th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

GREENWAVES TECHNOLOGIES Announces Next Generation GAP9 Hearables Platform Using GLOBALFOUNDRIES 22FDX Solution October 16th, 2020

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