Q.

Which of the following is correct statement

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a

silicon doped with boron is n-type semiconductor

b

silicon doped with arsenic is a p-type semiconductor

c

metals are good conductors of electricity

d

electrical conductivity of semiconductors decreases with increasing temperature

answer is C.

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Detailed Solution

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  • Silicon doped with boron is p-type semiconductor.
  • Silicon doped with arsenic is a n-type semiconductor.
  • Electrical conductivity of semiconductors increases with rise in temperature, since more electrons can jump to the conduction band. 
  • Substances like silicon and germanium show this type of behaviour and are called intrinsic semiconductors.
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Which of the following is correct statement