Could someone explain how to get rid of erroneous absorbance (Tailing effect) of a undoped semiconductor material due to defects and get more accurate band gap value during Tauc Plot?
Thank you.
From the tail you can calculate the Urbach energy first, that gives a measure of the defect density. Basically, it stands for the lowering of the effective gap due to shallow traps near the valence band maximum and conduction band minimum. Although it's not entirely possible to get rid of the tailing effect, the Urbach analysis will at least give you an idea of the possible error in the measurement, which might help you to take the right slope in the Tauc's plot, during bandgap determination. The following paper might help:
Article Size-modulation of functionalized Fe3O4: Nanoscopic customiz...
Souvik Bhattacharjee Thank you very much for your suggestion. That would be really helpful.
Dear Shalika Parakatawella . See the following useful RG link : Article Assessment of Correction Methods for the Band-Gap Problem an...
Kindly see also the following useful RG link: Article How To Correctly Determine the Band Gap Energy of Modified S...
Also check please the following useful RG link: Article Searching for Band-Dispersive and Defect-Tolerant Semiconduc...
The following RG link is also very useful: https://www.colorado.edu/faculty/zunger-matter-by-design/sites/default/files/attached-files/562.pdf
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