1.

Consider Si (E = 1.1 eV), Ge (E = 0.67 eV) and GaAs (Ec = 1.4 eV)

a) Using the same vertical scale, draw a simple energy band diagram (showing E

and E) for each of the three materials.

b) On the energy band diagram for Si, illustrate an electron in the conduction band.

c) On the energy band diagram for Ge, illustrate a hole in the valence band.