Energy Band Questions: How to Draw from Picture?

[orangeincup]

Homework Statement

See picture attached

Homework Equations

Graph based question

The Attempt at a Solution

So I was looking at an example and I wanted to know how this energy band diagram was drawn from the picture. As the x increased the doping level decreased, but how can I know if it will become closer to the valence band or the conduction band? You can dope semiconductors with both holes or electrons correct? So how am I suppose to know which way to draw my band diagram, should I assume it's the opposite of this if the doping is increased in the x direction?

 

[mark726]

Hello,

Great question! When it comes to drawing energy band diagrams for doped semiconductors, there are a few key factors to consider. First, you are correct that semiconductors can be doped with both holes and electrons. This is known as p-type and n-type doping, respectively.

In terms of which way to draw the band diagram, it ultimately depends on the type of doping used and the concentration of dopants. For example, in p-type doping, the concentration of holes will increase as you move towards the valence band. This means that the energy band diagram will show the valence band being closer to the Fermi level, while the conduction band will be further away.

On the other hand, in n-type doping, the concentration of electrons will increase as you move towards the conduction band. This means that the energy band diagram will show the conduction band being closer to the Fermi level, while the valence band will be further away.

In terms of determining which way to draw the band diagram for your specific case, it would be helpful to have more information about the type and concentration of doping used. If you are still unsure, you can always consult a textbook or ask your instructor for clarification.

I hope this helps! Good luck with your diagram.