Making an Integrated Circuit
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About
This podcast is drawn from the "Virtual Lab" of WeCanFigureThisOut.org. This Virtual Lab uses 3D virtual reality animations to explain electronics, microelectronics and nanotechnology. This podcast explains how the transistors of an integrated circuit are made.
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Recent episodes
- Let's go inside an Intel 4004 microprocessor to see an individual transistor
- To make this transistor, first oxide then nitride layers are grown
- A shadow mask then exposes a photographic emulsion
- Exposed nitride is then etched away
- Oxygen reacts with the Si to grow more oxide
- By heating in silane, polycrystal Si is then grown
- A stripe is exposed in a second photographic emulsion
- Exposed polycrystal Si is etched away leaving the transistor gate
- Phosphorus ions then penetrate thin oxide to create the source and drain
- Heating in oxygen grows an insulating coat on the gate