MOSfet Homework Assignment - Role of Dielectric Constant and Thickness

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Use the MOSfet tool on nanoHUB to simulate a n-channel MOSFET with the following parameters:

Lsd=LG=45nm (each 15 nodes), oxide thickness of 1.2 nm (K=3.9, 5 nodes),
poly-Si gate, junction depth of 10 nm (20 nodes), and all other parameters
at their nominal preset values.

Now, change K to 20, and the oxide thickness to 6 nm, and resimulate the

How do the Id vs. VG and Id vs. VD curves compare? (Hint: You need to go into the 'voltage sweep section' and turn on the Id-Vd sweep.)

The point of the problem is to realize that you can't get the same performance just by increasing the dielectric constant and the thickness--one has to make some other changes as well if you want the same currents from the device.

Cite this work

Researchers should cite this work as follows:

  • David K. Ferry (2008), "MOSfet Homework Assignment - Role of Dielectric Constant and Thickness,"

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  1. nanoelectronics
  3. MOS
  4. dielectric function