Before revision: Introduction 507x507px|While not apparent in a simple energy-position band diagram (left), the density of states (centre) in both the valance band and the condition band increases the further from the band gap.
After revision: Introduction 507x507px|While not apparent in a simple energy-position band diagram (left), the density of states (centre) in both the valance band and the conduction band increases the further from the band gap.