Conduction Band and Valence Band in Semiconductor
The band theory of solids gives the picture that there is a sizable gap between the Fermi level and the conduction band of the semiconductor. Based on the energy possessed by electrons in a semiconductor electrons are arranged in three energy bands Conduction band Fermi energy level Valency band. Material Classification Based On Energy Band Diagram Electricalvoice Semiconductor Physics Band Energy A pn junction is formed when two types of semiconductors n- type excess electrons and p- type excess holes come into contact. . GaAs is a direct band gap semiconductor which means that the minimum of the conduction band is directly over the maximum of the valance band Figure 3-3. Positively-charged holes in the valence band the next-to highest band. These electrons are depicted in the conduction bandWhen a certain amount of voltage is applied these electrons gain energy to cross the forbidden gap and leave the valence bandto enter into the conduc
