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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 Van de Graaff generators work by using a motor to separate charges.
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Let's go inside an Intel 4004 microprocessor to see an individual transistor
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Do you know how Van de Graaff generators work? Let's turn it on.
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To make this transistor, first oxide then nitride layers are grown
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There is only a motor, powering a pulley, connected to a belt, almost touched by a copper comb.
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The pulley is made of a special plastic. Let's fade away all but a few (exaggerated) plastic atoms.
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The pulley's plastic atoms will transfer electrons to the inside of the belt (it's just "static electricity").
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Exposed polycrystal Si is etched away leaving the transistor gate
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But now let's go back and figure out what the bottom copper comb does.
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Phosphorus ions then penetrate thin oxide to create the source and drain
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Electrons jump from the comb trying to reach the increasingly positive pulley.
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But these electrons cannot penetrate the belt and are carried away.
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This is an electron's worst nightmare as both sides of the belt are now negative!
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A third photographic emulsion defines windows above the source and drain
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But as they reach the top, the outer electrons can jump onto a second comb ...
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So the Van de Graaff uses the motor's work pushing electrons upward to build up "electrostatic energy."
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And finally, here is the circuit symbol for the transistor
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This podcast is drawn from the Virtual Lab presentations of
WeCanFigureThisOut.org. The copyrighted material of this site
was developed under funding from National Science Foundation
CCLI, NIRT, MRSEC ...
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This podcast is drawn from the Virtual Lab presentations of
WeCanFigureThisOut.org. The copyrighted material of this site
was developed under funding from National Science Foundation
CCLI, NIRT, MRSEC ...
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