Q. When a pentavalent impurity is added to a pure semiconductor, it becomes
Solution:
The process of adding impurities to intrinsic semiconductors to alter their properties is called doping . Trivalent and Pentavalent elements are used to dope Silicon and Germanium. When an intrinsic semiconductor is doped with Trivalent impurity it becomes P-Type semiconductor. P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions. When doped with Pentavalent impurities we get N-Type semiconductor, where N stands for Negative. N-type semiconductors have Negative charged ions or in other words have excess electrons in it.
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