Which of the following gives an n-type semiconductor?

ASilicon doped with boron
BSilicon doped with arsenic
CGermanium doped with gallium
DGermanium doped with indium

Answer: B

Group 15 dopants (As) have five valence electrons, one more than Si, so one electron per dopant is free (n-type). B, Ga and In are group 13 and create holes (p-type).

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