Doping graphene

Jun 01, 2010
Dopant chemicals adhere to a graphene sheet, modifying its properties for the development of ultra small and fast electronic devices. Credit: American Physical Society

An organic molecule that has been found to be effective in making silicon-based electronics may be viable for building electronics on sheets of carbon only a single molecule thick. Researchers at the Max Planck Institute for Solid State Research in Stuttgart report the advance in a paper appearing online in the journal Physical Review B on June 1.

Ultrathin carbon layers known as show promise as the basis for a host of extremely small and efficient electronic devices. But in order to create a useful component, the electronic properties of materials like silicon or graphene must be tailored through a doping process.

Typically, silicon-based devices are doped by replacing some of the atoms in a silicon crystal with various dopant atoms or molecules . In graphene, on the other hand, dopants are generally deposited on top of the carbon sheet rather than taking the place of some of the . Materials such as gold, bismuth and have been used to dope graphene with varying degrees of success.

Now, Max Planck Institute researchers have found that the compound F4-TCNQ (tetrafluoro-tetracyanoquinodimethane), which has been proven effective for producing LEDs in silicon, seems to fit the bill for graphene as well. F4-TCNQ forms stable layers on graphene that are fairly robust under exposure to elevated levels of heat and light, and can control graphene electrical properties in ways that suggest it may be a good dopant choice.

In a Viewpoint article in the current issue of APS Physics, Alexei Fedorov of the Lawrence Berkeley National Laboratory describes the challenges of creating electronic devices built of graphene and recent attempts to identify doping materials to do the job.

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More information: Charge neutrality and band-gap tuning of epitaxial graphene on SiC by molecular doping, C. Coletti, C. Riedl, D. S. Lee, B. Krauss, L. Patthey, K. von Klitzing, J. H. Smet, and U. Starke, Phys. Rev. B 81, 235401 (2010) - Published June 01, 2010, Download PDF (free)

Provided by American Physical Society

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Quantum_Conundrum
5 / 5 (1) Jun 01, 2010
Weeee...

I'm all for 100 core, 100ghz processors in our PCs.

Woot!