![]() ![]() ![]() In some atoms, electrons have five electrons in their valence band such as arsenic (As) and antimony (Sb). When an impurity is added to silicon or germanium without modifying the crystal structure, an N-type material is produced. ![]() Practically only after doping these materials become usable. After doping, an intrinsic material becomes an extrinsic material. ![]() The process of adding an impurity to an intrinsic or pure material is called doping and the impurity is called a dopant. Addition of impurity will change the conductor ability and it acts as a semiconductor. Practically usable semiconductors must have controlled quantity of impurities added to them. Pure Silicon or Germanium are rarely used as semiconductors. ![]()
0 Comments
Leave a Reply. |