Here is what goes on in A typical semiconductor foundry

Any of a class of crystalline solids in electrical conductivity between a conductor and an insulator is referred to as Semiconductor. Semiconductors are used in the manufacture of various kinds of electronic devices, such as diodes, transistors, and integrated circuits.

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A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass.

Their resistance falls as their temperature rises; conductors are the opposite. Its conducting properties may be altered in useful ways by introducing impurities into the crystal structure.

In two video, you get a peek of a typical semiconductor fab from Taiwan Semiconductor Manufacturing Company, Limited; a Taiwanese multinational semiconductor company (TSMC) and Global Foundry; a United States semiconductor foundry.