Stories tagged electronic

Dec
28
2008

Graphene memory is smaller

Graphene transistors: Graphene is an atomic-scale chicken wire made of carbon atoms.
Graphene transistors: Graphene is an atomic-scale chicken wire made of carbon atoms.Courtesy Carbophiliac
Computer memory devices become cheaper, faster, and smaller every year. A team of researchers at Rice University led by James Tour has found a method of creating a new type of memory from a strip of graphite only 10 atoms thick. Individual memory bits smaller than 10 nanometers that have only two terminals will allow super thin sheets of memory to be stacked in layers, multiplying the storage capacity.

Graphene memory is resistant to heat and cold

The graphene memory is able to operate in a very wide temperature range. The researchers have tested the system to minus 75 to over 200 degrees Celsius.

Graphene memory is faster and lasts longer

Researchers say that the new switches are faster than the lab's testing equipment can measure and they promise long life as well.

"We’ve tested it in the lab 20,000 times with no degradation,” said Tour. “Its lifetime is going to be huge, much better than flash memory."

Graphene memory is cheap and easy to produce

"The processes uses graphene deposited on silicon via chemical vapor deposition making for easy construction that can be done in commercial volumes with methods already available," says Tour.

Abstract of Rice University article in Nature

Here, we report that two-terminal devices consisting of discontinuous 5–10 nm thin films of graphitic sheets grown by chemical vapour deposition on either nanowires or atop planar silicon oxide exhibit enormous and sharp room-temperature bistable current–voltage behaviour possessing stable, rewritable, non-volatile and non-destructive read memories with on/off ratios of up to 107 and switching times of up to 1 mus (tested limit). Nature Materials

Source: Rice University News