In order to reach the inversion state in a semiconductor
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| (4.33) |
we must create a state of extreme non equilibrium.
The easiest way to do this is a pn junction with a strong bias in forward direction.
This leads to a strong current through the space charge region which generates the inversion.
In addition we need extremely high doped material to shift the Fermi energies into the bands itself.
Questions to solid state physics:
Why do the quasi Fermi energies bend so strongly with current flow?
e.g. extreme bending in the space charge region, but negligible bending in the bulk. Why?