The conductive properties of semiconductors are between metallic conductors and insulators, such as silicon and germanium materials.
Generally, the conductive resistance of these semiconductors is around a few megohm. The PN junction made of these materials constitutes the most basic unit of electronic components, which can be made into diodes, transistors, field effect tubes and so on. From these, powerful chips are made.
The general metal is only a conductor, it is impossible to make a PN junction with a single conductor.