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Molybdenum disulfide presents 2D platform for electronics

Posted: 28 Aug 2012 ?? ?Print Version ?Bookmark and Share

Keywords:molybdenum disulfide? electronic device? graphene? NAND?

Various research findings have placed molybdenum disulfide as another 2D platform for electronic devices, similar to graphene. In the past, the material has been used primarily as an industrial lubricant.

A year ago, scientists at the Swiss university ?cole polytechnique fdrale de Lausanne (EPFL) produced a transistor on the MoS2 material. Meanwhile, researchers at MIT have succeeded in making a variety of electronic components from MoS2. The researchers claim the material could help usher in radically new products, from whole walls that glow to clothing with embedded electronics to glasses with built-in display screens.

"It's the most exciting time for electronics in the last 20 or 30 years," indicated Toms Palacios, professor at EECS.

The MIT researchers found making progress with graphene difficult because that material lacks a bandgap, and MoS2 comes with one.

The lack of a bandgap means a switch made of graphene can be turned on, but not off. "That means you can't do digital logic," said researcher Han Wang.

Researchers have been searching for a material that shares some of graphene's extraordinary properties and has a bandgap, and molybdenum disulfide does.

Wang and Palacios were able to fabricate an inverter; a NAND gate; a memory device; and a ring oscillator, made up of 12 interconnected transistors, which can produce a precisely tuned wave output.

Also, by using one-molecule thick MoS2 material for transistors in large-screen displays to control each pixel of a display eliminates millions of atoms-thick silicon used in conventional transistors, potentially reducing cost and weight and improving energy efficiency, claimed the researchers.

Further on, the material could be used, in combination with other 2D materials, to make light-emitting devices lighting up an entire wall as well as for antenna and other circuitry of a cellphone being woven into the fabric of clothing, according to the researchers.

- Nicolas Mokhoff
??EE Times

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