Graphene Is Losing Favor as the Two-Dimensional Material of the Future

Making electronic components is proving to be much easier with molybdenum disulfide than with graphene

2 min read
Graphene Is Losing Favor as the Two-Dimensional Material of the Future

 

About 18 months ago, research at Ecole Polytechnique Federale de Lausanne’s (EPFL) Laboratory of Nanoscale Electronics and Structures in Switzerland was beginning to suggest that molybdenum disulfide (MoS2)—which occurs as the mineral molybdenite—may serve as preferable choice over graphene in a post-silicon world. 

Since that time, research has been hotly pursuing the use of this abundant mineral for electronic applications since not only does it possess some of graphene’s attractive qualities, but it brings them to the table with a band gap, unlike graphene. So attractive has this material become that even the discoverers of graphene are now focusing much of their research into using MoS2

Now researchers at MIT, who have struggled to get graphene to do anything in electronics except for some radio-frequency applications, have turned to MoS2 and have quickly managed to get the one-atom-thick material to serve as the basis for a variety of electronic components

The research, which was published this month in the journal Nano Letters ("Integrated Circuits Based on Bilayer MoS2 Transistors"),  produced an inverter, a NAND (Negated AND) gate, a memory device and a ring oscillator using large sheets of the MoS2.

The MIT researchers believe that this list of electronic components is only the beginning of what is possible with the material. One of the researchers, Tomás Palacios, Associate Professor in the Department of Electrical Engineering and Computer Science, believes that the material could find early applications in large-screen displays in which a separate transistor would control each pixel of the display.

Palacios further notes in the MIT press release that the MoS2 when used in combination with other 2-D materials could make light-emitting devices that could be made to make an entire wall glow, making for a warmer and less glaring light that comes from single light bulbs.

This work certainly seems to promise a far greater range of applications for the material than the EPFL research initially indicated. At that time, the Swiss researchers believed the material would probably see use as a complement to graphene in applications that required thin and transparent semiconductors. It seems now the material has much greater promise.

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Two Startups Are Bringing Fiber to the Processor

Avicena’s blue microLEDs are the dark horse in a race with Ayar Labs’ laser-based system

5 min read
Diffuse blue light shines from a patterned surface through a ring. A blue cable leads away from it.

Avicena’s microLED chiplets could one day link all the CPUs in a computer cluster together.

Avicena

If a CPU in Seoul sends a byte of data to a processor in Prague, the information covers most of the distance as light, zipping along with no resistance. But put both those processors on the same motherboard, and they’ll need to communicate over energy-sapping copper, which slow the communication speeds possible within computers. Two Silicon Valley startups, Avicena and Ayar Labs, are doing something about that longstanding limit. If they succeed in their attempts to finally bring optical fiber all the way to the processor, it might not just accelerate computing—it might also remake it.

Both companies are developing fiber-connected chiplets, small chips meant to share a high-bandwidth connection with CPUs and other data-hungry silicon in a shared package. They are each ramping up production in 2023, though it may be a couple of years before we see a computer on the market with either product.

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