What type of material has all electrons in the valence band?
Conductor
Semiconductor
Insulator
What type of material has a partially filled conduction band?
What type of material has a small gap between valence and conduction bands?
What type of material has a small proportion of impurity atoms in the material?
What type of material has a large gap between valence and conduction bands?
What type of material has no free charge carriers?
What energy band allows free movement of electrons?
Valence band
Gap between bands
Conduction band
How do energy bands compare in terms of energy levels?
Conduction bands have greater energy level than valence bands
Valence bands have greater energy level than conduction bands
Conduction bands and valence bands have the same energy level
If the temperature of a semiconductor is increased what happens to the current flow in the semiconductor?
Increases
No change
Decreases