The optical conductivity of crystal / thin film of the material obtained from reflectance data (or transmisttance) is of the order 10^7 to 10^13 /S ?? why?? is there any reason??
Crystal materials have a regular structure.
Structural defects, such as the absence of an atom (vacancy), interstitial, etc., create obstacles to the motion of electrons in the structure and are place for trapping electrons.
In fact, crystalline materials, by increasing the atomic order, reduce the barriers of electron motion and give a better response to photon radiation.
You should investigate the structural defects according to image analyzes (SEM, TEM).
The optical conductivity in solids is mainly due to excited electrons from the valence band to the conduction band as in semiconductors. The responding process in this case is the time needed for electron transition which occurs without any scattering particularly for direct transition materials
for more details you can see the book
”optical processes in semiconductors“
by J pankove
The following book by J. Pankove may help you: optical processes in semiconductors.
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