Researchers devise scalable method for fabricating high-quality graphene transistors

July 6, 2012 By Jennifer Marcus
Self-aligned graphene transistor

( -- Graphene, a one-atom-thick layer of graphitic carbon, has attracted a great deal of attention for its potential use as a transistor that could make consumer electronic devices faster and smaller.

But the material's unique properties, and the shrinking scale of electronics, also make graphene difficult to fabricate on a large scale. The production of high-performance graphene using conventional often leads to damage to the graphene 's shape and performance, resulting in problems that include parasitic capacitance and serial resistance.

Now, researchers from the California Institute at UCLA, the UCLA Department of Chemistry and Biochemistry, and the department of at the UCLA Henry Samueli School of Engineering and Applied Science have developed a successful, scalable method for fabricating self-aligned graphene transistors with transferred gate stacks. 

By performing the conventional lithography, deposition and etching steps on a sacrificial substrate before integrating with large-area graphene through a physical transferring process, the new approach addresses and overcomes the challenges of conventional fabrication. With a damage-free transfer process and a self-aligned device structure, this method has enabled self-aligned graphene transistors with the highest cutoff frequency to date — greater than 400 GHz.

The research demonstrates a unique, scalable pathway to high-speed, self-aligned graphene transistors and holds significant promise for the future application of graphene-based devices in ultra–high-frequency circuits.

The research was published in the July 2 issue of Proceedings of the National Academy of Sciences and is available online.

Explore further: Team reports scalable fabrication of self-aligned graphene transistors, circuits

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not rated yet Jul 06, 2012
400 GHz! How is it in terms of power efficiency?

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