In a semiconductor, the number density of intrinsic charge carriers at 27°C is 1.5 × 10¹⁶ m⁻³. If the semiconductor is doped with impurity atom, the hole density increases to 4.5 × 10²² m⁻³. The electron density in the doped semiconductor is _______ × 10⁹ m⁻³.
Physics · semiconductor
In a semiconductor, the number density of intrinsic charge carriers at 27°C is 1.5 × 10¹⁶ m⁻³. If the semiconductor is doped with impurity atom, the hole density increases to 4.5 × 10²² m⁻³. The electron density in the doped semiconductor is _______ × 10⁹ m⁻³.