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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.
The effects of semiconductor doping were long known empirically in such devices as crystal radio detectors and selenium rectifiers.However, the process was formally first developed by John Robert Woodyard working at Sperry Gyroscope Company during World War II.he effects of semiconductor doping were long known empirically in such devices as crystal radio detectors and selenium rectifiers. However, the process was formally first developed by John Robert Woodyard working at Sperry Gyroscope Company during World War II.