hw a type semi conducter is formed.a tetravalent host semi - TopicsExpress

hw a type semi conducter is formed.a tetravalent host semi conducter like germanium is doped with a trivalent impurity such as indium,gallium,alluminium or boron.the indium has three valancey electron which shares it with three nearby host atom to form three covalent bonds.covalent bond does not form with the forth nearst atom due to absence of one electron.therefore a vacancy is formed around the boron impurity and pulls electrons from it nearest atom which forms a hole around it. hence wen an atom loses

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