IBM has
developed what is reported to be one
of the fastest graphene-based integrated circuits (IC) to date, with an overall performance
that is up to 10,000 times
better compared to similar devices developed
previously
IBM built the
graphene-based IC as a radio frequency receiver that can perform signal
amplification, filtering, and mixing. The circuit was able to process text messages
without any distortion in a series
of tests
performed by the IBM research team.
One of the first examples of the use of graphene in
electronic applications took place in 2010
when Big Blue researchers engineered a graphene
device with a band
gap large enough to be used in
infrared (IR) detectors and emitters. This development was followed up a year
later when IBM developed a graphene transistor that can operate with frequencies up to 100 GHz
After another six months, IBM developed the first
graphene-based IC circuit, which was the predecessor of the model discussed in this article. The
precursor circuit served as a basic radio component called as broadband radio-frequency mixer, which processes signals
by finding the difference between two high-frequency wavelengths.
Supratik
Guha, director of physical sciences at IBM
research,
in a recent press conference said that “this is the first time that
someone has shown graphene devices and circuits to perform modern wireless
communication functions which so far have only been seen
in silicon ICs.”
The new
graphene-based ICs were also able to overcome problems such
as the degradation
of transistor performance with time. The
solution used to solve the issue was a new manufacturing
method where graphene is added in a later stage of the process in order to
prevent being damaged. However, the manufacturing method developed by the IBM
team still requires an expensive process to produce the high-quality graphene needed. New methods of producing
high-quality graphene at lower costs are under development.
In spite of all the doubts
about the potential of graphene to
yield benefits in electronic applications due to the lack of an inherent band gap, IBM has invested heavily in research and the latest results show that new
applications in smartphones and gadgets may soon become a reality
Shu-Jen Han of IBM
Research described the impact of this research in an IBM blog, saying that the development of the
graphene-based radio frequency receivers has the potential to enhance the
communication speed of wireless devices and pave the way toward new applications in consumer
electronics with performances beyond
what is possible to achieve with current silicon technology.
Han
stated that the integration of graphene radio frequency (RF) devices into current low-cost
silicon technology platforms
could also spur
a new wave of pervasive wireless communication, which in
turn would allow the development
of smart sensors, RFID tags, and similar devices to send data signals
at significant distances.
The
so-called “Internet-of-things”, a concept coined by Kevin Ashton back in the
late 90s, would rely heavily on smart sensors and RFIDs to create an
environment where objects and people would interact in an intelligent way using
an internet-like backbone.
About the Author
This article was written by Matteo Martini, author and CEO of Martini Tech, a company that provides nanoimprint, PSS patterning, MOCVD deposition, sputtering, MEMS foundry, GaN wafer, GaN LED Technology and other
microfabrication-related services. Please have a look at our blog.