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Which barrier forms when a silicon semiconductor crystal is overly doped?

A)Reduced electron mobility forms
B)Increased thermal conductivity results
C)Zener tunneling breakdown begins
D)Increased electron-hole recombination happens

💡 Explanation

Zener tunneling occurs because a high doping concentration narrows the depletion region, therefore increasing the electric field within the band. This enables electrons to tunnel through the barrier, rather than causing increased thermal conductivity under normal conditions.

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