How to plot graph eurbach energy (Eu) and optical energy gap? What range refers to urbach energy? Is it above optical energy gap? How do we decide for Eu range when we are plotting a graph in(alpha) vs. energy? Can someone show how to decide/choose a best line to get urbach energy gap?
Thank you.
The urbach energy range below energy gap
www.kottan-labs.bgsu.edu/teaching/workshop2001
A reasonable description of the physical origins of the Urbach tail in disordered materials can be found here: http://www.physics.udel.edu/~glyde/Pubs/115.pdf
As for calculating the energy of the bandgap in the presence of an Urbach tail, the method proposed by Tauc is widely used in the study of optical properties of chalcogenide glasses. The method can be found here: http://www.sciencedirect.com/science/article/pii/0022309372901949
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