Which mechanism limits electron mobility when doping semiconductors at very high concentrations?

💡 Explanation

When doping semiconductors heavily, increased ionized impurity concentration causes electron deflection via Coulombic interactions known as impurity ion scattering, limiting the electron's mean free path and mobility. Therefore, impurity ion scattering dominates, rather than phonon scattering, Auger recombination, or bandgap narrowing, which have other dependencies.

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