A material is made from Al, Ga, and As. The mole fractions of these elements are 0.25, 0.26, and 0.49, respectively. This material would be
A) an insulator.
B) an n-type semiconductor.
C) a metallic conductor because Al is present.
D) a p-type semiconductor.
E) none of these

Question

Quizplus · Accepted Answer

The material is made up of GaAs, which is a compound semiconductor. The mole fraction of Ga is more than that of Al, which makes it an n-type semiconductor. However, the mole fraction of As is the highest, so it would be more likely to act as an acceptor and create p-type conductivity. Therefore, this material would most likely be a p-type semiconductor.

A Material Is Made from Al, Ga, and As