Dear Rishabh Sharma!
The semiconductors' nanoparticles absorption spectrum could has very complex structure, because band-band absorption is not only possible light absorption mechanism. Please, attach measured spectrum to your question for clarifying it.
Sincerely,
Daniil Stupin
Measure the absorbance spectra of material and use Tauc's absorption equation
a hu = B (hu- Eg)^n
Where a is the absorption coefficient, hu is the incident
photon energy and B is the constant. The band gap was calculated from the extrapolated straight line intercept of (a
hu )^1/2 versus (hu) plot , for indirect band gap .
(a hu )^2 versus (hu) plot , for direct band gap .
Extrapolated linear portion intercepts the energy axis (hu) and the interception point is considered as band gap.
Dear Rishab Sharma,
A Tauc plot is used to measure the optical bandgap in semiconductors.
Regards
Engin
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