alleryIndium, boron and aluminium are dopants that are:
APentavalent
BTetravalent
CUnivalent
DTrivalent
Answer & Solution
Correct answer: D. Trivalent
1. These atoms carry three valence electrons each.
2. That is one fewer than the silicon they replace.
3. So they are trivalent dopants.
_Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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