Hi I would like to calculate the band gap for pyrophosphates. I am getting two peaks when i plot the tauc plot. Which peak i have to extrapolate whether the 1st one or the second one , if the x axis scale is lower to higher in photon energy?
On extrapolating both peaks in the tauc plot, you get two different values of energy gap. The lesser one should correspond to the bandgap while the other should be assigned to the higher energy transition. By looking at the band-diagram of the material of interest, you can assign the higher-energy transition as well.
Dear colleague V.Elakkiya Chandru,
Have a nice time and good day,
The two peaks means you have two gaps the first one at higher wavelength corresponds to the optical gap
and the second one at lower wavelength, corresponds to the fundamental gap.
The attached paper may help you.
I wish this is useful and help you.
Yours
A. EL-Denglawey
Thank you dear Eldenglawey ,
I could not able to find the attachement. Please help me in this regard
Dear colleague V.Elakkiya Chandru,
Have a nice time and good day,
I'm already attached again the paper. Please confirm me if you get it or not?
I wish this is useful and help you.
Yours
A. EL-Denglawey
well, it depends on what kind of material ( in terms of dimensions) you are talking about. I have seen even more than 3 peaks in Tauc plots for the material in 2 - dimensions. Here the overall material will consists of different number of layer and as we know that the energy gap depends on the number of layers you have.
Good luck..
You can easily draw Tauc Plot Online on this link -
https://www.instanano.com/2020/05/draw-tauc-plot-from-uv-vis-absorbance.html
the explanation which I found and seems logical is in the link,
https://www.youtube.com/watch?v=P6Ioh6OunoU&t=392s
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