Question

Which of the following can be used as an n-type dopant for silicon?
Select the correct option(s).

• A. Arsenic
• B. Boron
• C. Gallium
• D. Phosphorous

Hint:

For n-type doping, elements from Group V of the periodic table, such as Arsenic and Phosphorous, are commonly used because they have five valence electrons and donate extra electrons to the conduction band.

Answer 1

The Correct Option is A, D

(A) Arsenic:
Arsenic is a Group V element, which has five valence electrons. When it is used as a dopant in silicon, it donates one electron to the conduction band, making it an n-type dopant.

(B) Boron:
Boron is a Group III element, which has three valence electrons. It creates a "hole" in the silicon structure, making it a p-type dopant.

(C) Gallium:
Gallium is also a Group III element, like Boron, and behaves in a similar way by creating holes in the silicon lattice, making it a p-type dopant.

(D) Phosphorous:
Phosphorous is a Group V element, which has five valence electrons. Like Arsenic, it can donate an electron to the conduction band, making it an n-type dopant.

Thus, the correct answers are (A) Arsenic and (D) Phosphorous.