Majority carriers of P type material

P-type semiconductor:

• Extrinsic P-type Semiconductor is formed when a trivalent impurity is added to a pure semiconductor
• Example of trivalent impurity are Boron, Gallium, and Indium
• Trivalent impurity like boron has 3 valence electrons.
• Each atom of the impurity fits in the silicon crystal by forming covalent bonds with the surrounding silicon atoms
• The dopant boron atom has one less electron than surrounding silicon and thus vacancy is generated that acts as a hole. 
• Therefore, holes are in majority in the p-type semiconductors. 

Pentavalent impurities:

Impurity atoms with 5 valence electrons produce n-type semiconductors by contributing an extra electron.

This is as explained in the figure: