Allowed Energies  

 

Use the program to search for the allowed energies. The red allowed, energy lines result from the interaction of the regular solid potential energy diagrams and the green allowed, energy lines result from the impurity potential energy diagram. Sketch the resulting allowed energies.

 

Notice in your results that the allowed energies related to the impurity are found inside the energy gap (between the conduction and valence bands) and below the valence band.

Now use the Energy Band Creator to see what happens to energy states when the depth of the impurity is less than the other wells. Record your results.