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â ScienceWhich effect occurs when increasing dopant concentration in extrinsic semiconductors?
A)Band gap energy narrowing occursâ
B)Electron mobility always increases linearly
C)Thermal runaway always is prevented
D)Intrinsic carrier concentration always decreases
đĄ Explanation
Band gap narrowing occurs because increased dopant concentration introduces statistically significant interactions between the dopant's quantum orbitals, causing distortions; therefore, the gap shrinks, rather than intrinsic carrier concentration decreasing, which would dominate at very low temperatures.
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