Doping is the process of adding impurities to intrinsic semiconductors to alter their properties. Normally Trivalent and Pentavalent elements are used to dope Silicon and Germanium.When a intrinsic semiconductor is doped with Trivalent impurity it becomes a P-Type semiconductors.The P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions.ence N-type (Negative Type) extrinsic semiconductor (silicon in this case) is made by doping the semiconductor with pentavalent element. To create a P-type semiconductor, all we must do is to pop in a trivalent element into the lattice. A trivalent element has three electrons in its valence shell.