Hi all
I am currently working on ab-initio calculation for ceramic materials(AlN, Al2O3...) and I want to see some experimental result about band gap and fermi level pinning in order to verify my calculation data. I tried to use UPS analysis but it is hard to analyze wide band gap materials.
So is there any other recommended techniques for measuring fermi level pinning and band structure?
For the (optical) band gap, ellipsometry comes to mind, see e.g.
Article Ellipsometric study of the electronic band structure of CrO_...
For the actual band structure, you could also try EELS instead of ARUPS, but of course you will still have charging issues.
See also this discussion:
https://www.researchgate.net/post/How-can-I-measure-the-band-gap-of-insulators
XPS can also be used to measure the band gap of wide band gap materials, as demonstrated in our publication:
Article Band offsets at κ-([Al,In] x Ga 1-x ) 2 O 3 /MgO interfaces
This method is also independent of charging.
Jürgen Weippert Thanks for your recommendation!
Actually I want to see that the changes and pinning of Fermi level according to different type of dopants. Is it also possible to check this point by using ellipsometry?
Thorsten Schultz Thank you so much!
It is very interesting method! could you share your publication? I want to know more about it
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