To The Moon

The process starts with high-purity quartz, mostly silicon dioxide. Ordinary sand contains too many metallic and mineral impurities to be used for semiconductors.

Quartz is heated with carbon in an electric arc furnace at very high temperature. The carbon removes oxygen from silicon dioxide and produces metallurgical-grade silicon. This silicon is roughly 99% pure, but is still far too impure for chips.

Semiconductor silicon has to be extremely pure. The silicon is converted into gas, purified through distillation, and then reacted with hydrogen. The final material is electronic-grade polysilicon. This purified polysilicon is then used for wafer production.

The purified polysilicon is placed into a very clean crucible and heated until it melts.

Silicon melts at about 1414°C, or 1687 K. Once molten, it becomes a controlled pool of liquid silicon that can be grown into a single crystal.

A tiny piece of single-crystal silicon is dipped into the molten silicon and slowly pulled upward while rotating. As it moves out of the melt, silicon atoms attach to it and solidify in the same crystal structure. This creates a large cylindrical silicon ingot.

The silicon ingot is sliced into very thin circular discs, called wafers, using an ultra-fine wire saw

These wafers become the base surface where chips are built.

One wafer can hold hundreds or even thousands of chips, depending on the size of each chip.

Freshly sliced wafers are still rough at a microscopic level.

They are ground, chemically treated, polished, cleaned, and inspected until the surface becomes extremely flat and mirror-like.

Before manufacturing starts, engineers design the chip.

They define the architecture, logic, memory structures, power delivery, and layout.

That design is turned into many physical pattern layers.

Each layer needs a photomask.

The wafer is coated with photoresist, a light-sensitive chemical film.

This layer changes when exposed to light.

Photoresist allows the fab to transfer tiny circuit patterns onto the wafer surface.

A lithography machine transfers the chip pattern into the photoresist.

The most advanced chips use EUV lithography, which uses 13.5 nm light and reflective optics.

After exposure, the wafer is treated with chemicals that remove selected parts of the photoresist.

Depending on the type of photoresist, either the exposed or unexposed parts are removed.

What remains is a temporary protective pattern on the wafer.

The exposed areas are processed through steps like etching, deposition, ion implantation, annealing, and polishing.

This is where the chip slowly starts to take shape, layer by layer, and create the complex logic gates of a processor.

Before cutting the wafer, the fab tests the chips while they are still on the wafer.

Tiny probes touch test pads and check whether each die works.

This helps identify good dies and bad dies before they move on to packaging.

The wafer is cut into separate chips called dies.

Each die is one physical chip or one chiplet, depending on the design.

The cutting has to be extremely precise because the dies are fragile and very expensive at this stage.

The good dies are placed into a package.

The package protects the silicon and gives it a way to connect to the motherboard or socket.

Modern chips require very advanced packaging and include chiplets, substrates, underfill, heat spreaders, and dense electrical connections.

The packaged chips are tested again under different workloads, temperatures, and power conditions.

Chips that pass are sorted by performance and efficiency. This is why chips from the same design can be sold as different models.

The finished chips are ready to be installed.

Now you have a chip. And one of the most complex manufacturing process humans have ever built.