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Which mechanism increases electron mobility within MOSFETs at cryogenic temperatures?

A)Reduced phonon scattering event rates
B)Increased electron-electron interactions
C)Elevated impurity ionization probability
D)Enhanced surface plasmon polaritons excitation

💡 Explanation

Lower temperature reduces atomic vibrations, decreasing phonon scattering because electron transport is less impeded via lattice imperfections; therefore, electron mobility increases, rather than electron-electron interactions dominating, which are significant at high densities, typically at room temperatures.

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