Which mechanism causes valence electron mobility to sharply decrease in a semiconductor when the temperature increases significantly?

💡 Explanation

When temperature increases, lattice vibrations intensify, and enhanced electron-phonon scattering occurs because electrons collide more frequently with phonons, disrupting their movement and reducing mobility. Therefore electron-phonon scattering is the main cause, rather than altering the band gap, dielectric constant, or electron-hole recombination which exhibit weaker temperature dependencies.

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