= Solution
Suitable substitutional donors include \b[Si on a Ga site] and \b[O on an N site]. The former replaces a group-III atom with a group-IV atom; the latter replaces a group-V atom with a group-VI atom. Each provides an extra valence <electron> relative to its host site. Si is a plausible substitutional cation-site dopant, and the compact oxygen atom is compatible with an anion site. Site compatibility matters: merely choosing an element with an extra <electron> without considering which sublattice it occupies is insufficient.
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