editor's blog
Subscribe Now

Graphene Quilts

A while back we looked at wide bandgap materials like GaN when used for power devices, but, along with power comes heat and the need for it to be dissipated. GaN isn’t great for that; the old sapphire substrates were very bad, and newer (and more expensive) SiC substrates are better but not sufficient, according to researchers at UC Riverside.

Metal is often used as a heat sink, but its ability to do so in very thin films dissipates because the main “mobile” element is the electron. In graphene, however, the main dissipative component is the phonon – essentially, the ability to carry the crystal vibration efficiently, and this remains effective even for just a few layers.

So they built transistors with “quilts” of graphene on the actual transistor drains, connecting it to graphite heat sinks (although they say other heat sinks are possible too). These can be more effective because they insinuate themselves deep into the circuit without substantially disrupting the topology due to their use of “few-layer graphene” (FLG).

Of course, today, graphene is typically obtained by flaking graphite – something of an inexact science. They see graphene growth as a reality in the future, which would make the whole process a bit more deterministic.

You can find out more and get access to a paper published in Nature here

Leave a Reply

featured blogs
Oct 16, 2019
This year, I was excited to be one of 10 Cadence employees selected from 130 applicants to participate in the company'€™s first international volunteer service immersion program with the nonprofit... [[ Click on the title to access the full blog on the Cadence Community si...
Oct 16, 2019
The top level of product categories on Samtec.com feature our Connectors, Cables, Optics, and RF pages, which give users a jumpoff point into the four main categories of products that Samtec sells. These pages were first released in 2016 with a very simple approach, to get th...
Oct 15, 2019
As technology advances, it's becoming harder and harder to know what is real and what isn't....
Oct 15, 2019
We recently participated in a presentation discussing something that is certainly creating a significant impact these days…  Read more about a cloud-ready solution available to the semiconductor industry, and then watch the video. Over hundreds, and even thousands...
Oct 11, 2019
[From the last episode: We looked at subroutines in computer programs.] We saw a couple weeks ago that some memories are big, but slow (flash memory). Others are fast, but not so big '€“ and they'€™re power-hungry to boot (SRAM). This sets up an interesting problem. When ...