uva virtual lab podcasts

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:09

individual physics electronics microscopes scanning atoms nanotechnology science education stm university of virginia tunneling nanoscience 3d animation microelectronics stms john c. bean uva virtual lab scanning tunneling microscope

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 and NUE programs. This project is led by John C. Be

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:33

Here is our do it yourself silicon atom kit

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

Unwanted metal is etched away completing the transistor

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:09

Put it into the silicon crystal

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

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 and NUE programs. This project is led by John C. Be

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:33

Completing this MOS transistor

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:10

The positive plate draws in the electrons

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:05

But add metal plate just above the bar . . .

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

Does the bar conduct? Not yet!

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

Put donor atoms into the other end of the bar

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:07

More donors => a cloud of electrons

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:09

The donor's electron starts to wander

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

Create a donor atom with 5 bonding electrons

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

First, let's make the nucleus of the atom

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:05

Make a bar of silicon crystal

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:07

Take a look at its planes and facets

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:16

Start to make a crystal

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:03

Make a 2nd atom and form a bond

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:09

Move them farther apart

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:03

And finally the four bonding electrons

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:09

And six more

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

Add the first two electrons

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 0:06

And finally, here is the circuit symbol for the transistor

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:08

A fourth photographic emulsion is patterned

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:10

To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:06

physics virtual reality electronics nanotechnology science education stm let's take university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

But how do we first position the probe only a nanometer or so from the sample surface?

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:11

physics surface probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics first position nanometer john c. bean uva virtual lab scanning tunneling microscope

A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:10

current distance physics constant holds probe electronics nanotechnology feedback loops electron science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

A voltage induces electrons to jump from the probe's tip to the sample atoms.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:16

jump physics electronics atoms nanotechnology voltage science education stm electrons university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

The heart of the STM is an atomically sharp probe.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics sharp probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:06

physics virtual reality electronics nanotechnology science education stm let's take university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:09

individual physics electronics microscopes scanning atoms nanotechnology science education stm university of virginia tunneling nanoscience 3d animation microelectronics stms john c. bean uva virtual lab scanning tunneling microscope

This STM is so simple that we use it in UVA classes. But it also earned two physicists the Nobel Prize in 1986.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:13

simple physics classes nobel prize earned electronics physicists nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

It's done by ratcheting this cylinder in until an electron current is sensed.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:31

current physics electronics nanotechnology electron science education stm cylinder university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

The voltage to the back crystal determines pixel color. Voltages on the other crystals move the probe and pixels side-to-side and up-and-down.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:30

color physics crystals probe electronics determines pixels nanotechnology voltage science education stm university of virginia nanoscience 3d animation microelectronics side to side john c. bean uva virtual lab scanning tunneling microscope

Metal is sprayed on to the surface

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:03

Let's see how these work together to create an atomic scale map of the sample surface.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:11

scale physics surface atomic work together electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

A third crystal moves it up and down.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

Another crystal moves it side to side.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics side to side john c. bean uva virtual lab scanning tunneling microscope

Voltages to a piezoelectric crystal move the probe in and out.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:23

physics probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics piezoelectric john c. bean uva virtual lab scanning tunneling microscope

But how can it move the probe over these tiny nanometer distances?

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:12

physics probe electronics nanotechnology science education distances stm university of virginia nanoscience 3d animation microelectronics nanometer john c. bean uva virtual lab scanning tunneling microscope

A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:10

current distance physics constant holds probe electronics nanotechnology feedback loops electron science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

A voltage induces electrons to jump from the probe's tip to the sample atoms.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:16

jump physics electronics atoms nanotechnology voltage science education stm electrons university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

The heart of the STM is an atomically sharp probe.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics sharp probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

But how can it move the probe over these tiny nanometer distances?

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:12

physics probe electronics nanotechnology science education distances stm university of virginia nanoscience 3d animation microelectronics nanometer john c. bean uva virtual lab scanning tunneling microscope

Voltages to a piezoelectric crystal move the probe in and out.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:23

physics probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics piezoelectric john c. bean uva virtual lab scanning tunneling microscope

Another crystal moves it side to side.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics side to side john c. bean uva virtual lab scanning tunneling microscope

Exposed nitride is then etched away

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:07

Openings are then etched in the exposed oxide

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:07

A third photographic emulsion defines windows above the source and drain

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:10

Heating in oxygen grows an insulating coat on the gate

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:06

Phosphorus ions then penetrate thin oxide to create the source and drain

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:12

Exposed polycrystal Si is etched away leaving the transistor gate

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:09

A stripe is exposed in a second photographic emulsion

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:10

By heating in silane, polycrystal Si is then grown

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:04

Oxygen reacts with the Si to grow more oxide

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:12

A shadow mask then exposes a photographic emulsion

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:12

A third crystal moves it up and down.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:15

physics electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

To make this transistor, first oxide then nitride layers are grown

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:11

Let's go inside an Intel 4004 microprocessor to see an individual transistor

Making an Integrated Circuit

Play Episode Listen Later Jul 24, 2017 0:13

This STM is so simple that we use it in UVA classes. But it also earned two physicists the Nobel Prize in 1986.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:13

simple physics classes nobel prize earned electronics physicists nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

It's done by ratcheting this cylinder in until an electron current is sensed.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:31

current physics electronics nanotechnology electron science education stm cylinder university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

But how do we first position the probe only a nanometer or so from the sample surface?

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:11

physics surface probe electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics first position nanometer john c. bean uva virtual lab scanning tunneling microscope

The voltage to the back crystal determines pixel color. Voltages on the other crystals move the probe and pixels side-to-side and up-and-down.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:30

color physics crystals probe electronics determines pixels nanotechnology voltage science education stm university of virginia nanoscience 3d animation microelectronics side to side john c. bean uva virtual lab scanning tunneling microscope

Let's see how these work together to create an atomic scale map of the sample surface.

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Jul 24, 2017 0:11

scale physics surface atomic work together electronics nanotechnology science education stm university of virginia nanoscience 3d animation microelectronics john c. bean uva virtual lab scanning tunneling microscope

All of the scenes together

How Semiconductors and Transistors Work

Play Episode Listen Later Jul 24, 2017 2:54

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 and NUE programs. This project is led by John C. Be

Scanning Tunneling Microscope - How Nanoscientists see Atoms

Play Episode Listen Later Dec 31, 1969 0:33

project programs funding material physics developed drawn electronics presentations national science foundation nanotechnology john c science education stm university of virginia nanoscience 3d animation microelectronics virtual lab john c. bean uva virtual lab scanning tunneling microscope

Podcasts about uva virtual lab

Best podcasts about uva virtual lab

Scanning Tunneling Microscope - How Nanoscientists see Atoms

How Semiconductors and Transistors Work

Making an Integrated Circuit

Latest podcast episodes about uva virtual lab

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

Phosphorus ions then penetrate thin oxide to create the source and drain

And finally, here is the circuit symbol for the transistor

Unwanted metal is etched away completing the transistor

A fourth photographic emulsion is patterned

Metal is sprayed on to the surface

Openings are then etched in the exposed oxide

A third photographic emulsion defines windows above the source and drain

Heating in oxygen grows an insulating coat on the gate

Exposed polycrystal Si is etched away leaving the transistor gate

All of the scenes together

A stripe is exposed in a second photographic emulsion

By heating in silane, polycrystal Si is then grown

Oxygen reacts with the Si to grow more oxide

Exposed nitride is then etched away

A shadow mask then exposes a photographic emulsion

To make this transistor, first oxide then nitride layers are grown

Let's go inside an Intel 4004 microprocessor to see an individual transistor

All of the scenes together

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 and NUE programs. This project is led by John C. Be

Here is our do it yourself silicon atom kit

Unwanted metal is etched away completing the transistor

Put it into the silicon crystal

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 and NUE programs. This project is led by John C. Be

Completing this MOS transistor

The positive plate draws in the electrons

But add metal plate just above the bar . . .

Does the bar conduct? Not yet!

Put donor atoms into the other end of the bar

More donors => a cloud of electrons

The donor's electron starts to wander

Create a donor atom with 5 bonding electrons

First, let's make the nucleus of the atom

Make a bar of silicon crystal

Take a look at its planes and facets

Start to make a crystal

Make a 2nd atom and form a bond

Move them farther apart

And finally the four bonding electrons

And six more

Add the first two electrons

And finally, here is the circuit symbol for the transistor

A fourth photographic emulsion is patterned

To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

But how do we first position the probe only a nanometer or so from the sample surface?

A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

A voltage induces electrons to jump from the probe's tip to the sample atoms.

The heart of the STM is an atomically sharp probe.

To see how a Nanosurf easyScan STM works, let's take it apart in virtual reality.

Scanning tunneling microscopes (STMs) allow nanoscientists to see individual atoms.

This STM is so simple that we use it in UVA classes. But it also earned two physicists the Nobel Prize in 1986.

It's done by ratcheting this cylinder in until an electron current is sensed.

The voltage to the back crystal determines pixel color. Voltages on the other crystals move the probe and pixels side-to-side and up-and-down.

Metal is sprayed on to the surface

Let's see how these work together to create an atomic scale map of the sample surface.

A third crystal moves it up and down.

Another crystal moves it side to side.

Voltages to a piezoelectric crystal move the probe in and out.

But how can it move the probe over these tiny nanometer distances?

A feedback loop holds the electron current constant by keeping the distance from probe to sample constant.

A voltage induces electrons to jump from the probe's tip to the sample atoms.

The heart of the STM is an atomically sharp probe.

But how can it move the probe over these tiny nanometer distances?

Voltages to a piezoelectric crystal move the probe in and out.

Another crystal moves it side to side.

Exposed nitride is then etched away

Openings are then etched in the exposed oxide

A third photographic emulsion defines windows above the source and drain

Heating in oxygen grows an insulating coat on the gate

Phosphorus ions then penetrate thin oxide to create the source and drain

Exposed polycrystal Si is etched away leaving the transistor gate

A stripe is exposed in a second photographic emulsion

By heating in silane, polycrystal Si is then grown

Oxygen reacts with the Si to grow more oxide