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The band just above the valence band is the:

ADepletion layer
BConduction band
CForbidden region
DImpurity levels
Answer & Solution
Correct answer: B. Conduction band
1. Free electrons need a band they can move in. 2. It lies immediately above the filled band. 3. That is the conduction band. 4. So the answer is conduction band. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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