PhET-Simulations-for-Physics/C3/Semiconductors/English
Semiconductors
Author: Vidhi Thakur
Keywords: PhET simulation, dopants, diode, valence band, conduction band, donor, acceptor, depletion region video tutorial.
Visual Cue | Narration |
Slide Number 1
Title Slide |
Welcome to this spoken tutorial on Semiconductors. |
Slide Number 2
Learning Objectives |
In this tutorial, we will learn,
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Slide Number 3
System Requirement |
Here I am using
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Slide Number 4
Pre-requisites https://spoken-tutorial.org |
To follow this tutorial the learner should be familiar with topics in high school science.
Please use the link below to access the tutorials on PhET simulations. |
Slide Number 5
Link for PhET simulation point to |
Please use the given link to download the PhET simulation.
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Point to the file in the Downloads folder. | I have downloaded the Semiconductors simulation to my Downloads folder. |
Double click the file to open | To open the simulation double click on the file. |
Cursor on the interface. | This is the interface of Semiconductors simulation. |
Cursor on main panel.
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The main panel consists of a circuit.
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Cursor on electrons. | Electrons are represented as blue spheres in the circuit. |
Cursor on dopants.
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Two blank spaces are provided in the circuit to add two dopants.
A dopant is an impurity added to semiconductors to modify their conductivity. |
Point to the P Type and N Type dopants at the bottom. | At the bottom right P-type dopant is represented as red spheres and N-type as green spheres.
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Cursor on dopant.
Cursor on valence band. |
An electrode is connected to each dopant.
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Cursor on conduction band. |
The high energy band is the conduction band.
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Cursor on right panel.
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On the right panel the Segments section is present.
It consists of one and two as options.
The two(2) segments provide space for two dopants. |
Click on segment one.
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Let us first select segment one(1).
Here only one segment is present. |
Cursor on bands. | The electrode attached to the dopant expands into bands with electrons and holes.
The higher energy band is the conduction band with high energy. |
Drag and add P-type in space in the bottom of the circuit.
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Let’s drag and place a P-type dopant to fill in the purple space in the circuit.
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Click on down arrow till -4V. | Now let us decrease the voltage to -4 volts.
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Click on Clear Dopants. | Let us clear dopants now. |
Drag and add N-type dopant and click up arrow till 4V.
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Add N-type dopant to the space and increase the voltage to 4 volts.
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Click the down arrow till -4V.
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Now let us change the voltage to -4 , that is. change the terminal of the battery.
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Click on two segment. | Now let us select segments two(2). |
Drag and add P-type dopant in the left space.
Click the arrow till 4V.
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Drag and add P-type dopant in the left space and increase the voltage to 4 volts.
This is because P-type dopant is an acceptor. |
Cursor on internal force and battery force.
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Internal force is zero and battery force is from left to right.
So, there is no flow of current in the circuit. |
Drag and add an N-type dopant in the right space.
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Let us drag and add an N-type dopant in the right space.
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Cursor on battery.
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Here the positive terminal of the battery is connected to N-type.
Negative terminal is connected to the P-type.
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Cursor on valence band and conduction band. | Empty space is filled by electrons in the P-type dopant.
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Click on down arrow till -4V.
Cursor on battery. |
Now let us slowly change the voltage to -4 Volts.
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Click on Clear Dopants.
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Now let”s clear the dopants.
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Cursor on battery and internal force. | Internal force is zero and battery force is in the right direction.
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Drag and add a P-type dopant in the right space.
Cursor on battery
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Let us drag and add P-type dopant in the right segment.
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Click on down arrow till -4V.
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I will now change the voltage to -4 Volts.
Only holes are left.
Internal force and battery force are in the left direction. So, we see no flow of current. |
Slide Number 6
Summary |
With this we come to the end of this tutorial.
Let's summarise.
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Slide Number 7
Assignment |
As an assignment,
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Slide Number 8
About Spoken Tutorial Project |
The video at the following link summarizes the Spoken Tutorial project.
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Slide Number 9
Spoken tutorial workshops |
We conduct workshops using spoken tutorials and give certificates.
For more details, please contact us. |
Slide Number 10
Answers for THIS Spoken Tutorial |
Please post your timed queries in this forum. |
Slide Number 12
Acknowledgement |
Spoken Tutorial project is funded by the Ministry of Education (MoE), Govt. of India |
This is Vidhi Thakur, a FOSSEE summer fellow 2022, IIT Bombay signing off.
Thank you for joining. |