Which of the following statements about semiconductors are correct?

AThe conductivity of an intrinsic semiconductor increases with temperature.
BSilicon doped with arsenic is an n-type semiconductor.
CAn n-type semiconductor carries a net negative charge.
DSilicon doped with boron is a p-type semiconductor.

Answer: A, B, D

As (group 15) donates extra electrons: n-type (true). B (group 13) creates holes: p-type (true). Heating promotes more electrons to the conduction band (true). Doping adds atoms that are electrically neutral, so the crystal as a whole stays neutral (false).

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