Question Detail
Question
Which of the following is true about intrinsic semiconductor?
i. Each semiconductor atom undergo paired sharing of electrons with four neighbouring atoms.
ii. Conduction is due equally to holes and electrons.
iii. Group V atoms in the semiconductor share four electrons with four neighbouring atoms with an extra electron.
Iv. Band structure is between that of metals and insulators.
i. Each semiconductor atom undergo paired sharing of electrons with four neighbouring atoms.
ii. Conduction is due equally to holes and electrons.
iii. Group V atoms in the semiconductor share four electrons with four neighbouring atoms with an extra electron.
Iv. Band structure is between that of metals and insulators.
Correct Answer
Option B is the correct answer.
Detailed Explanation
i. True: Intrinsic semiconductors (Group IV elements like Silicon) form four covalent bonds with neighboring atoms.ii. True: In intrinsic semiconductors, thermal energy creates electron-hole pairs, leading to an equal concentration of free electrons and holes.iii. False: Group V atoms are used for doping to create n-type (extrinsic) semiconductors, not intrinsic ones.iv. True: Semiconductors have a forbidden energy band gap that is smaller than insulators but larger than metals (where bands overlap).
Hint
Recall the atomic structure, charge carriers, and band theory characteristics specific to intrinsic semiconductors.