Pure silicon is not conductive. However, it can be made conductive by adding other elements to its crystalline structure, which then become known as "n-type" or "p-type" silicon. N-type silicon is ...

so where N-type semiconductors are doped with electron donors, P-type semiconductors use dopants that act as electron acceptors. Boron fits into the crystal lattice just like silicon atoms ...

A semiconductor that uses a silicon or gallium arsenide substrate composed of a single crystal. Its atomic structure is the same throughout the material. Contrast with amorphous semiconductor.