Statement I: Conductivity of silicon increases by doping it with group 15 elements. Statement II: Doping means introduction of small amount of impurities like P, As or Bi into the pure silicon crystal

Question

Statement I: Conductivity of silicon increases by doping it with group 15 elements. Statement II: Doping means introduction of small amount of impurities like P, As or Bi into the pure silicon crystal.

Prashant Kotian · Accepted Answer

Correct answer: B. Statement I is correct: doping silicon with Group 15 elements introduces extra free electrons, forming an n-type semiconductor and increasing conductivity. Statement II is also correct: doping is indeed the introduction of trace impurities. However, Statement II is a definition of doping and does not explain why Group 15 elements specifically increase conductivity (the explanation is the presence of 5 valence electrons vs 4 in silicon).

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