The silicon doped with gallium forms

Step-by-step solution

Silicon is a Group 14 element with four valence electrons. Gallium is a Group 13 element with three valence electrons. When silicon is doped with gallium, the gallium atoms replace some of the silicon atoms in the crystal lattice. Since gallium has only three valence electrons, it can form only three covalent bonds with the surrounding silicon atoms. This creates a vacancy or a hole in the fourth bond, which acts as a positive charge carrier. Therefore, doping silicon with gallium results in the formation of a p-ty