What do microchip transistors look like physically and how are they wired?

Question

I have watched several youtube videos on how transistors work but all the explanations use a classic resin coated transistor with three prongs you can solder to you project . What I just can’t seem to grasp is how the that can be translated to a solid silicon disk.

Physically, how are the three layers separated (npn/pnp); and more importantly, how do you wire up a billion of them?

In: 1

Answer 1

[NMOS Transistor Step-by-Step](https://youtu.be/w_znRopGtbE?si=iw36UC1CySDmGtsY)

I work in the semiconductor manufacturing industry and there are still some things I don’t understand but this video can give you an idea of how it is accomplished. A silicon wafer has hundreds on chips with thousands of transistors on them.