Question

Ge is doped with As. Due to doping:}

• A. the structure of Ge lattice is distorted.
• B. the number of conduction electrons increases.
• C. the number of holes increases.
• D. the number of conduction electrons decreases.

Hint:

Doping a semiconductor with a group-V element increases the number of conduction electrons, resulting in an $n$-type semiconductor.

Answer 1

The Correct Option is B

Doping germanium (Ge), a group-IV element, with arsenic (As), a group-V element, results in an $n$-type semiconductor. Arsenic, possessing five valence electrons, provides excess electrons (conduction electrons) to germanium, which has four. These surplus electrons are then available for electrical conduction, thereby augmenting the concentration of conduction electrons.Consequently, doping Ge with As achieves the following outcome:\[\boxed{\text{an increase in the number of conduction electrons}}\]