Which of the following dopant is added in silicon to obtain n-type semiconductor?

To create an n-type semiconductor from silicon, a pentavalent impurity from Group 15 is introduced. These elements possess five valence electrons, with four forming covalent bonds with silicon atoms and the fifth becoming a conduction electron.

Arsenic (As) is a Group 15 element, functioning as a donor impurity that provides free electrons. Boron (B), gallium (Ga), and indium (In) are Group 13 elements that create p-type semiconductors by accepting electrons.