…
continue reading
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.
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Let's go inside an Intel 4004 microprocessor to see an individual transistor
0:13
0:13
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:13
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Do you know how Van de Graaff generators work? Let's turn it on.
0:14
0:14
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:14
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Turn it off and the charge stays on the dome.
0:03
0:03
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:03
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
To make this transistor, first oxide then nitride layers are grown
0:11
0:11
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:11
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
To understand what is going on, let's look inside.
0:11
0:11
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:11
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
A shadow mask then exposes a photographic emulsion
0:12
0:12
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:12
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
There is only a motor, powering a pulley, connected to a belt, almost touched by a copper comb.
0:21
0:21
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:21
-
…
continue reading
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Oxygen reacts with the Si to grow more oxide
0:12
0:12
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:12
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
The pulley is made of a special plastic. Let's fade away all but a few (exaggerated) plastic atoms.
0:15
0:15
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:15
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
The pulley's plastic atoms will transfer electrons to the inside of the belt (it's just "static electricity").
0:16
0:16
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:16
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
By heating in silane, polycrystal Si is then grown
0:04
0:04
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:04
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
A stripe is exposed in a second photographic emulsion
0:10
0:10
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:10
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
The inside of the belt becomes more and more negative.
0:16
0:16
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:16
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Exposed polycrystal Si is etched away leaving the transistor gate
0:09
0:09
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:09
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
But now let's go back and figure out what the bottom copper comb does.
0:09
0:09
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:09
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Phosphorus ions then penetrate thin oxide to create the source and drain
0:12
0:12
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:12
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Electrons jump from the comb trying to reach the increasingly positive pulley.
0:14
0:14
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:14
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Heating in oxygen grows an insulating coat on the gate
0:06
0:06
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:06
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
But these electrons cannot penetrate the belt and are carried away.
0:11
0:11
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:11
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
This is an electron's worst nightmare as both sides of the belt are now negative!
0:19
0:19
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:19
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
A third photographic emulsion defines windows above the source and drain
0:10
0:10
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:10
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
But as they reach the top, the outer electrons can jump onto a second comb ...
0:18
0:18
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:18
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Openings are then etched in the exposed oxide
0:07
0:07
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:07
-
…
continue reading
-
…
continue reading
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
A fourth photographic emulsion is patterned
0:10
0:10
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:10
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
So the Van de Graaff uses the motor's work pushing electrons upward to build up "electrostatic energy."
0:30
0:30
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:30
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
Unwanted metal is etched away completing the transistor
0:09
0:09
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:09
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
And finally, here is the circuit symbol for the transistor
0:08
0:08
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:08
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
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 ...
0:33
0:33
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:33
-
…
continue reading
![Artwork](/static/images/128pixel.png)
1
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 ...
0:33
0:33
Mais Tarde
Mais Tarde
Listas
Like
Curtido
0:33
-
…
continue reading
-
…
continue reading
-
…
continue reading