Page 1 of 1

Graphene transistor clocked at 427 GHz

PostPosted: Wed Aug 21, 2013 8:37 am
by 8l
http://www.pnas.org/content/early/2012/ ... 9.full.pdf

High-frequency self-aligned graphene transistors with transferred gate stacks

California Nanosystems Institute, University of California,
Los Angeles, CA 90095
Edited by Paul L. McEuen, Cornell University, Ithaca, NY, and approved June 8, 2012 (received for review April 4, 2012)
Graphene has attracted enormous attention for radio-frequency
transistor applications because of its exceptional high carrier mo-
bility, high carrier saturation velocity, and large critical current den-
sity. Herein we report a new approach for the scalable fabrication
of high-performance graphene transistors with transferred gate
stacks. Specifically, arrays of gate stacks are first patterned on a
sacrificial substrate, and then transferred onto arbitrary substrates
with graphene on top. A self-aligned process, enabled by the un-
ique structure of the transferred gate stacks, is then used to posi-
tion precisely the source and drain electrodes with minimized
access resistance or parasitic capacitance. This process has there-
fore enabled scalable fabrication of self-aligned graphene transis-
tors with unprecedented performance including a record-high cut-
off frequency up to 427 GHz. Our study defines a unique pathway
to large-scale fabrication of high-performance graphene transis-
tors, and holds significant potential for future application of gra-
phene-based devices in ultra–high-frequency circuits.

Re: Graphene transistor clocked at 427 GHz

PostPosted: Wed Aug 21, 2013 10:08 am
by Gravis
do remember that a single transistor is a lot different than a complete processor. graphene is only interesting if have no concerns about power or heat. it should do well in space. :)

the tech i'm far more interested in is the QDCA (Quantum Dot Cellular Automata because it's very low power. they just have to solve that pesky manufacturing issue. :P

Re: Graphene transistor clocked at 427 GHz

PostPosted: Wed Aug 21, 2013 10:35 pm
by 8l
thanks for the info!
i will look at QDCA.

TIA

Re: Graphene transistor clocked at 427 GHz

PostPosted: Tue Aug 27, 2013 12:35 am
by 8l
this is somewhat old, but i like to share.
Making graphene supercapacitors with a DVD writer [3-16-2012]
https://www.youtube.com/watch?v=_oEFwyoWKXo

Re: Graphene transistor clocked at 427 GHz

PostPosted: Fri May 16, 2014 4:43 pm
by dhanhurley
Hi from Tübingen University, Baden-Württemberg, DE.

MOLYBDENITE is much more interesting as a computer chip or solar cell etc.
Their are problems with GRAPHENE.

Ciao... Dhan Hurley