Which of the following statements about extrinsic semiconductors is INCORRECT?
A) They are generally made from pure Si or Ge with small amounts of impurities.
B) n-type are those in which the impurity is an element of Group 15.
C) p-type are those in which the impurity is an element of Group 13.
D) The crystal need not be very pure before the impurity is added to produce the semiconductor.
E) Boron is a common impurity in n-type extrinsic semiconductors.
Correct Answer:
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