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The energy needed to free the fifth electron of a donor atom in silicon is about:
A0.72 eV
B5.4 eV
C0.05 eV
D1.1 eV
Answer & Solution
Correct answer: C. 0.05 eV
The extra donor electron is so weakly bound that about 0.05 eV frees it in silicon, far below the 1.1 eV gap.
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