A silicon wafer (nᵢ = 1.5 × 10¹⁶ m⁻³) is doped with indium, a group-13 element, at a concentration of 2.5 × 10²² m⁻³. Taking every dopant atom as ionised, what type of semiconductor is the wafer, and what is the ratio of its majority-carrier concentration to its minority-carrier concentration?