Physics 2015 JAMB Past Questions - Question 8: A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. The most likely group of the element is

Correct Answer

C

Explanation

If a silicon material is doped with an element to create an n-type semiconductor, the most likely group of elements the dopant belongs to is Group V of the periodic table. Group V elements have five valence electrons, and when they are used as dopants in silicon, they introduce extra electrons into the crystal lattice, creating an excess of negative charge carriers (electrons). This results in the formation of an n-type semiconductor, where electrons are the majority charge carriers.

Common elements from Group V that are used as dopants in silicon to create n-type semiconductors include phosphorus (P), arsenic (As), and antimony (Sb). Phosphorus is one of the most commonly used dopants for this purpose due to its prevalence and effectiveness in introducing extra electrons into the silicon lattice. These extra electrons are mobile charge carriers, which significantly enhance the conductivity of the material.