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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.
Doping Silicon. You can change the behavior of silicon and turn it into a conductor by doping it. In doping, you mix a small amount of an impurity into the silicon crystal. There are two types of impurities: 1  N-type-In N-type doping, phosphorus or arsenic is added to the silicon in small quantities.2  Phosphorus and arsenic each have five outer electrons, so they're out of place when they get into the silicon lattice.3  The fifth electron has nothing to bond to, so it's free to move around.here are two types of impurities: 1  N-type-In N-type doping, phosphorus or arsenic is added to the silicon in small quantities. 2  Phosphorus and arsenic each have five outer electrons, so they're out of place when they get into the silicon lattice.