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Physics of electronics

Discussion in 'General Electronics Discussion' started by ebrahim120, Sep 11, 2012.

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  1. ebrahim120


    Aug 18, 2012
    I have a thin film of insulator material which has a thickness about 30 nanometer and on top of that I have a gate electrode which has a thickness of 50 nanometer that I use for creating a electric field thought the insulator layer. Usually people say the electric filed pattern after thin film is broadening, but recently I heard it is quit depend on the thickness of electrode and insulator layer, and how far I am measuring the field from electrode. Does anybody knows about this ?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    What you are talking about is called a fringe field. A rather theoretical discussion is here.
    On second thought you describe a MOSFET. You'll find information on this e.g. here and here.

    And yes, the field will not be uniform but vary with location and distance from the electrode. Unfortunately I cannot quickly find a suitable reference - most refenreces assume a rather large capacitor with uniform field between the plates and ignore the edge effects.
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