Tauc plot always gives the approximate value of the band gap. You can simply calculate the band gap using Tauc plot by taking the extrapolation and the intercept on x-axis will give the approximate Eg value of particular material. One can use it also for publication. It is acceptable.

Regards

Dear Afroz Khan ,

Yes, It's right. In my situation, I want to know some different ways to calculate the energy band-gap of semiconductors. I know have some different way but I have some unclear about it.

Dear Doan

This paper will help your problem

J. Phys. Chem. Lett. 2018, 9, 23, 6814–6817

Follow this link

https://pubs.acs.org/doi/10.1021/acs.jpclett.8b02892

We used barium sulphate standard spectroscopy method to determine the band gap of iron doped TiO2 nano particles.

However, this method has many errors due to the step of taking the spermatozoa. What is this supposed to mean?

I have the same question with Nhamo Chaukura.

Thank Afroz Khan !

Dear Prof. S. Feroz ,

Can you explain more about your method?

Dear all,

We have 3 ways to calculate the band-gap of a semiconductor from the UV-Vis spectrum. Option 1: use Tauc spectrum, method 2: use derivative, method 3: Muka equation ... (I can't remember the name). Method 1 is obvious, but the latter two are very vague.

Welcome Doan...

Dear Doan

It's a standard comparison method between the transmission/absorbance spectrum of barium sulphate and iron doped TiO2 using UV-vis spectroscopy.

Its same procedure used in Tauc spectrum right? We can use Beer Lambert equation to determine the band gap?

Dear Prof. S. Feroz ,

Two methods that I remind above will not have errors (there is no linear step).

Thanks Doan...I think we should try all methods on known band gap of semiconductor and check the accuracy?

S. Feroz Yes, I agree with you.

Tauc method with absorbance and reflectance spectroscopy is used to calculate band gap energy in recent papers also.