Actually I've got the DRS (diffuse reflectance Spectroscopy) results of my samples i.e. WO3 Nanoparticles, and I've applied Kubelka Munk function to get the band gap of my results but its much more than it is reported, the reported results of the band gap of WO3 is from 2.4 eV to 3 eV (max), so I want to know is kubelka-munk function the reliable method to find the band gap of materials?
you must using a Tauc plot for WO3 indirect semiconductor (αhν)1/2 versus energy (hν).. alfa its the absorbance obtain from kubleka munk curve. 1/2 its related to indirect band gap. the extrapolation to linear part in energy will be the optical band gap.
Astro, but the problem here is that we have nothing to do with the tauc plot, because there is reflectance data against the wavelength... so we can not have tauc plot for these values, how can we varify the bandgap (Eg) with having reflectance spectra...I heard there're some more methods for finding the bandgap as well... is it right? If yes what are they? Dr. Roberto
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