P-Type Material

P-Type Material

P-type material is produced when the dopant that is introduced is from Group III.   Group III elements have only 3 valence electrons and therefore there is an electron missing.  This creates a hole (h+), or a positive charge that can move around in the material.  Commonly used Group III dopants are aluminum, boron, and gallium.The 2D diagram to the left shows the hole  that will be present when a Group III dopant is introduced to a material such as silicon.  This hole is quite mobile in the same way the extra electron is mobile in a n-type material.