Understanding AlGaAs/GaAs Band Gap and Conduction Band Offset Variations

Click For Summary

Homework Help Overview

The discussion revolves around the variations of conduction band offset (CBO) in AlGaAs/GaAs structures as a function of aluminum concentration. Participants are exploring the relationship between aluminum content and its impact on band gap and CBO.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand how the conduction band offset varies with aluminum concentration and are questioning the qualitative aspects of this relationship. Some are seeking specific references to journal articles for more detailed information.

Discussion Status

The discussion is active, with participants providing insights into the nature of the band offset and its dependence on aluminum concentration. There is an acknowledgment of the need for further reading to obtain precise data, and some participants are exploring the rationale behind the increase in CBO with higher aluminum content.

Contextual Notes

Participants note the challenge of accessing journal articles due to paywalls, which may limit their ability to find specific experimental data on conduction band offsets.

daffoddill
Messages
8
Reaction score
0
how the conduction band offset varies with Al concentration?? what is the different?
 
Physics news on Phys.org
This is a very vague question. If you want specific numbers you will have to read journal articles on experiments that measure conduction band offsets. If you want a qualitative answer, you know AlAs/GaAs is a type I band offset, with AlAs having the larger band gap. And when you have GaAs/GaAs, there is no offset. So as you increase Al concentration, the CBO will increase all the way to the max CBO of AlAs/GaAs. To find the exact form of the increase in the CBO you need to read journals.
 
let say for AlGaAs/GaAs/AlGaAs structure, why Al increases the conduction band offset in this case?

do you have any suggestion about the link that i can access to the journal? There's a lot of them but need to pay.
 
I just told you why Al increases the CBO. Since it increases the band gap, and you also know the initial % Al = 0 then CBO = 0 and the final % Al = 1 then CBO > 0. Therefore as you increase Al concentration you must increase the CBO.

As for the journals, I can't help you there.
 

Similar threads

How Does Band Gap Influence Lattice Spacing in Materials?
  • · Replies 1 ·
Replies
1
Views
2K
Semiconductor quatum well find band gap question
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Insulator band gap and applied voltage?
  • · Replies 2 ·
Replies
2
Views
3K
Lorentzian lineshape, uncertainty principle and AlGaAs conduction band offset
  • · Replies 3 ·
Replies
3
Views
4K
Undergrad Why diode with larger band gap has larger onset potential?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate The main charge carrier in the ionic crystal is polaron or conduction?
  • · Replies 2 ·
Replies
2
Views
2K
Quick question about semiconductor alloys and band gaps?
  • · Replies 1 ·
Replies
1
Views
4K
Graduate Why is the band offset of an LED equal to the band gap?
  • · Replies 1 ·
Replies
1
Views
3K
Undergrad Are the electrons in the conduction band completely free?
  • · Replies 11 ·
Replies
11
Views
4K
Energy band gap when there is an electric field
  • · Replies 1 ·
Replies
1
Views
2K