- Displaying Energy Scales
- We run into difficulty when we attempt to display all three
energies on one computer screen. If we use an energy that separates
the conduction and impurity band energies, the valence band energy
would be off the bottom of the screen near your feet.
On the other hand, if we display the energies of the conduction
and valence band energies, the impurity band energy is so close
to the conduction band energy that we cannot distinguish between
- To see all three energies conveniently we need a compromise.
Our solution is to display two energy scales. The one on the
right shows the correct energies for the conduction and impurity
bands while the one on the left displays valence and conduction
band energies (see digram to the right). To help you remember
the bands touch only the energy scale relevant to them.