Correct option is C
An intrinsic semiconductor is a pure semiconductor without any significant dopant atoms present.
Its electrical properties are purely determined by the semiconductor material itself, without any impurities.
Germanium (Ge): Germanium is a group IV element and is a well-known intrinsic semiconductor material. It has four valence electrons, which form covalent bonds with neighboring atoms in a crystal lattice. At room temperature, thermal energy can excite some electrons from the valence band to the conduction band, allowing it to conduct electricity.
Bismuth (Bi): Bismuth is a metal, not a semiconductor.
Boron (B): Boron is a group III element and is typically used as a dopant in semiconductors to create p-type materials. It is not an intrinsic semiconductor itself.
Antimony (Sb): Antimony is a group V element and is commonly used as a dopant to create n-type semiconductors. It is not an intrinsic semiconductor itself.
Therefore, Germanium is the correct answer as it is a common intrinsic semiconductor material.
