Super-fast Transistors from Graphene March 20, 2012Posted by stuffilikenet in Brilliant words, Science.
These guys from Institut d’Electronique, de Microélectronique et de Nanotechnologie in Villaneueve d’Ascq, France and Northwestern University in Evanston, Illinois have published a modest little paper in Nano Letters1 detailing the delightful electrical properties of electrophoretically-deposited graphene on a polyimide sheet: the charge mobility in the transistors is in the region of 100 cm2/Volt second, a far higher value than those of semiconductor molecules or polymers. These transistors get very high frequencies – around 8 GHz – a level of performance never before obtained in organic electronics, and it’s very, very flexible. “Our graphene flexible transistors have current gain cutoff frequencies of 2.2 GHz and power gain cutoff frequencies of 550 MHz. Radio frequency measurements directly performed on bent samples show remarkable mechanical stability of these devices and demonstrate the advantages of solution-based graphene field-effect transistors over other types of flexible transistors based on organic materials.” So, here’s another good candidate method for making the roll-up video screens I want for my Phone oph the Phuture(tm). The synthesis of the materials is apparently not difficult.
1. Nano Letters is an absolute joy to read this week. Talk about forehead-smacking physical surface chemistry done on impossibly-detailed, infinitely-small substrates, this bunch of whackos has actually gone and made pH-Programmable DNA Logic Arrays Powered by Modular DNAzyme Libraries. I always thought that DNA-based calculators were kind of a fever dream of futurists, science-fiction writers and other whack jobs, but serious geeks are already working on it and are mad enough to publish in a peer-reviewed journal. There are sundry other miracles of the surface chemist’s art, things I never dreamt when I was a lad at school late nights all alone at the test tube, oh, oh, oh, oh.