Which mechanism limits electron mobility within the inversion layer of a MOSFET at high gate voltages?

💡 Explanation

At high gate voltages, the electric field forces electrons closer to the Si-SiO2 interface; surface roughness causes increased scattering because electrons collide more frequently with imperfections, limiting mobility. Therefore, surface roughness scattering limits electron movement, rather than phonon scattering, oxide tunneling, or Boltzmann saturation, which arise due to other physical mechanisms or effects..

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