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← ScienceWhich outcome occurs when increased temperature narrows the band gap?
A)Intrinsic carrier concentration exponentially increases✓
B)Drift mobility decreases linearly
C)Fermi level shifts deep into bands
D)Applied voltage offsets contact depletion
💡 Explanation
Intrinsic carrier concentration experiences exponential growth because band gap narrowing leads to increased thermal excitation of electrons across the gap via thermal radiation increasing the number of electron-hole pairs; therefore conductivity goes up, rather than Fermi level shifts arising, linked to doping
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