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A pentavalent impurity is known as a:

ADonor
BCarrier
CBarrier
DBlocker
Answer & Solution
Correct answer: A. Donor
1. It contributes one extra electron to the crystal. 2. That electron is available for conduction. 3. So the pentavalent impurity is a donor. 4. The answer is donor. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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