Intrinsic Semiconductor
An intrinsic semiconductor is a pure, undoped semiconductor material that has equal numbers of electrons and holes. This results in a neutral charge overall, and very low electrical conductivity. By introducing impurities (doping) into the material, its electrical conductivity can be improved, leading to the creation of n-type or p-type semiconductors which are used in the fabrication of electronic devices such as transistors and solar cells.
Silicon (Si) and Germanium (Ge) are two examples of intrinsic semiconductors.