Making an Integrated Circuit episodes:

• July 24, 2017Let's go inside an Intel 4004 microprocessor to see an individual transistor

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• July 24, 2017To make this transistor, first oxide then nitride layers are grown

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• July 24, 2017A shadow mask then exposes a photographic emulsion

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• July 24, 2017Exposed nitride is then etched away

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• July 24, 2017Oxygen reacts with the Si to grow more oxide

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• July 24, 2017By heating in silane, polycrystal Si is then grown

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• July 24, 2017A stripe is exposed in a second photographic emulsion

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• July 24, 2017Exposed polycrystal Si is etched away leaving the transistor gate

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• July 24, 2017Phosphorus ions then penetrate thin oxide to create the source and drain

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• July 24, 2017Heating in oxygen grows an insulating coat on the gate

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