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Could Graphene Become the Next Silicon?

  1. Jan 27, 2008 #1
    Last edited: Jan 27, 2008
  2. jcsd
  3. Jan 28, 2008 #2
  4. Jan 29, 2008 #3

    Gokul43201

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    Did you mean to say "graphite" above? Graphene is defined as a monoloayer sheet of graphite, and to my knowledge, the linear dispersion with the Dirac points exists independent of sheet dimensions.
     
  5. Jan 29, 2008 #4

    dst

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    The links say graphene ribbon.
     
  6. Jan 29, 2008 #5

    Gokul43201

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    Yes, I didn't read the article fully. Apparently, there's something about on/off ratios in very narrow ribbons. I have no idea what that means - perhaps something to do with the drop in conductivity upon gating?
     
    Last edited: Jan 29, 2008
  7. Jan 30, 2008 #6
    Nano-ribbons (quasi-1D graphene wires) generally have a gap between the conduction and valence bands at the Dirac point. Also, the band structure of bilayer graphene looks parabolic around the Dirac point.
     
  8. Jan 30, 2008 #7
    Didn't Geim already make a "lossless" transistor from graphene nano-ribbons? I guess the difference here is that the sample by Geim was obtained "by chance", whereas the above articles focuses mainly on the fact that GNRs can be made in a controlled way.

    This is an article about the Geim transistor:

    http://www.rsc.org/chemistryworld/News/2007/February/28020703.asp
     
  9. Jan 30, 2008 #8
    I believe researchers at Max Planck Institute also created windowpane electrodes from graphene for solar windowpanes.

    Graphene devices seem to currently underperform silicon ones despite graphene's superior carrier mobility, so I assume there's a lot of room for optimization/improvement to get the most out of the material.

    Now that simple alkaline solutions can be used to make graphene, I wonder how long it will be before we see the manufacture of very large wafers for microprocessors, solar panels, and perhaps even TV displays?
     
  10. Jan 31, 2008 #9
    Nano-ribbons and nanotubes (both graphite) have both been used as diodes, you can make nano-radios with them. It definitely looks like they have some application in the future of computing.
     
  11. Feb 6, 2008 #10
    We've all heard about strained silicon:

    http://en.wikipedia.org/wiki/Strained_silicon

    What about strained graphene? What properties would that likely exhibit?
    Normal graphene already has an extremely high electrical conductivity. But just as strained silicon has a higher conductivity than ordinary silicon, would strained graphene show any particular improvement?
     
  12. Feb 18, 2008 #11
    Since graphene has to be whittled down to ~10nm scale in order to become more semiconductive for less leaky gates, then maybe a technology like this one could help achieve that:

    http://focus.aps.org/story/v21/st6
     
  13. Feb 18, 2008 #12
    Last edited: Feb 18, 2008
  14. Feb 22, 2008 #13
    http://nanotechweb.org/cws/article/tech/32967

    from the article:

    Looks like graphene can do all sorts of interesting things that silicon can't.
     
  15. Feb 27, 2008 #14
  16. Mar 4, 2008 #15
  17. Mar 6, 2008 #16
  18. Mar 25, 2008 #17
  19. Mar 27, 2008 #18
    Graphene for Optical Displays

    Graphene is great for optical displays too!

    http://physicsworld.com/cws/article/news/33522

     
    Last edited: Mar 27, 2008
  20. Mar 27, 2008 #19
    Couldn't graphene be similarly useful as an electrode for solar cells? If it could be similarly manufactured in very large dimensions for that purpose, then perhaps it could bring down the cost of solar power.
     
  21. Apr 5, 2008 #20
    Muons in Graphene

    Graphene is said to affect its electrons in such a way so as to make them effectively "massless"

    http://www.sciencedaily.com/releases/2008/04/080403140918.htm

    I'd like to then ask how other heavier leptons, like muons, would behave in graphene?

    What would muons do? Would they also behave masslessly?

    If so, could this property be usefully exploited for experimental purposes, for example to even probe the nature of graphene or of muons themselves?
     
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