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← ScienceWhich outcome limits the conductivity of a gallium arsenide semiconductor at high temperatures?
A)Increased phonon scattering of electrons✓
B)Auger recombination dominating carrier density
C)Grain boundary formation impeding transport
D)Impurity deionization reducing carrier mobility
💡 Explanation
At high temperatures, increased thermal vibrations create more phonons, causing increased phonon scattering because lattice atoms vibrate more vigorously, impeding electron flow. Therefore enhanced phonon scattering limits conductivity, rather than recombination, grain boundaries, or deionization effects which require different conditions or materials imperfections.
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