Which mechanism causes decreased conductivity when silicon is increasingly doped with boron?

A)Increased electron-hole recombination rate✓

B)Formation of metallic Fermi surfaces

C)Decreased phonon scattering events

D)Widening of the conduction band

💡 Explanation

Increased boron doping enhances electron-hole recombination rate because boron creates acceptor energy levels within the band gap, facilitating electron transitions from the valence band. Therefore, conductivity decreases rather than increasing phonon scattering or widening bands under other conditions.

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Which mechanism causes decreased conductivity when silicon is increasingly doped with boron?

💡 Explanation

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