Donor and recipient energy bands in doped semiconductor

In summary: IIn summary, electrons in the donor and recipient energy bands in doped material play a crucial role in the conduction of electricity. They reside between the conduction and valence bands and have a lower ionization energy, making it easier for them to participate in the flow of electric current. While some models may not include them in their calculations, they are still an important factor in the conductivity of doped semiconductors.
  • #1
Godwin Kessy
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Are the electrons in the donor and recipient energy bands in doped material involved in conduction of electricity, and why?
 
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  • #2
Godwin Kessy said:
Are the electrons in the donor and recipient energy bands in doped material involved in conduction of electricity, and why?

Sounds like a schoolwork question. Please tell us what you know so far about electrons in the conduction band...
 
  • #3
No it's not a class question. I just found my self asking this question and not really getting a compromise. Look here it's clear that not only the conduction band but also the valence band is involved in electric conductivity as it the usual current in conduction band and the hole current in valence band. Now what about the electrons residing in the donor and the recipient bands residing in the doped semiconductors? got it?
 
  • #4
I am assuming you mean the donor and acceptor levels.

You mention it's clear that not only the conduction but also valence band is involved in electric conductivity. So why is it not also clear that the donor and acceptor levels are involved as they reside between the conduction and valence band? It takes even less energy to ionize from (or to) them, which is their point.

Unless a donor and acceptor band is something else entirely... In which case I'll need you to define it for me.
 
  • #5
@Esi... It's not clear as we all see that they are not included in the calculations. They are actually assumed not to be involved... For the reason am looking for.. Got it?
 
  • #6
Maybe this will help.

band3.gif


http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html
 
  • #7
Godwin Kessy said:
It's not clear as we all see that they are not included in the calculations.

Which calculations? The free carrier count?
Some models do include them. See this link for example:
http://ecee.colorado.edu/~bart/book/book/chapter2/ch2_6.htm#2_6_4

If your book does not include them then they likely made some simplifying assumptions. Things like the level is small, fully ionized, donor and acceptors are balanced. Or more simply, the levels all contain no carriers and therefore do not contribute to the count.
 

1. What are donor and recipient energy bands in doped semiconductors?

Donor and recipient energy bands refer to the energy levels or states that are created in a semiconductor material when it is doped with impurities. These energy bands play a crucial role in the electrical conductivity of the semiconductor.

2. How do donor and recipient energy bands affect the conductivity of doped semiconductors?

The presence of donor and recipient energy bands in a doped semiconductor can increase its conductivity by providing extra charge carriers. Donor energy bands add free electrons, while recipient energy bands create free electron holes, both of which contribute to the conductivity of the material.

3. What is the difference between donor and recipient energy bands?

The key difference between donor and recipient energy bands is the type of impurity that creates them. Donor energy bands are created by adding impurities with extra valence electrons, while recipient energy bands are created by adding impurities with fewer valence electrons.

4. How are donor and recipient energy bands formed in doped semiconductors?

Donor and recipient energy bands are formed when impurities are introduced into the crystal lattice of a semiconductor material during the manufacturing process. The impurities create localized energy levels within the band gap of the semiconductor, which can then act as donor or recipient energy bands.

5. What are some applications of donor and recipient energy bands in doped semiconductors?

The ability to control and manipulate donor and recipient energy bands in doped semiconductors is crucial for many technological applications. These include the development of transistors, solar cells, and other electronic devices, as well as the creation of different types of sensors and detectors.

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