Which of the following statements is true about semiconductors?
A) Pure silicon and germanium are called intrinsic semiconductors.
B) In extrinsic semiconductors,the number of electrons in the conduction band is determined by the temperature and the magnitude of the band gap.
C) Dopants are present in intrinsic semiconductors.
D) The conductivity of intrinsic semiconductors is controlled by adding small numbers of different atoms.
E) The types of intrinsic semiconductors include p-type and n-type semiconductors.

Question

Quizplus · Accepted Answer

Pure silicon and germanium are called intrinsic semiconductors because they have a naturally occurring small number of impurities, and their electrical conductivity is based solely on the movement of electrons and holes. Extrinsic semiconductors, on the other hand, have impurities intentionally added to control their conductivity. The number of electrons in the conduction band in extrinsic semiconductors is not determined solely by temperature and band gap magnitude but also by the number and type of impurities added. Dopants are not present in intrinsic semiconductors, and the conductivity of intrinsic semiconductors cannot be controlled by adding small numbers of different atoms. Finally, the types of extrinsic semiconductors include p-type and n-type, not intrinsic semiconductors.

Which of the Following Statements Is True About Semiconductors