If germanium has to be doped with a donor impurity, the foreign atom should be
Correct answer: C. pentavalent
- A. tetravalent
- B. trivalent
- C. pentavalent
- D. none of the above
Explanation
To create n-type semiconductors, germanium (or silicon) is doped with a pentavalent impurity, which provides extra electrons to the crystal lattice. Common pentavalent dopants include phosphorus and arsenic.
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