Is there any one who can tell me the relation between reflectance and transmittance to calculate the band gap from UV-Vis data?

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Khalid Haneen

Dear Dr. Endris Taju Seid,

the band gap value can estemated from the incident photon energy and absorption coefficient, which calculate from absorbance and film thickness.

Best regards

Abdelkader Hafdallah

I agree with Khalid Haneen

Michel Stchakovsky

As a first approach :

R = reflectance

T = Transmittance

They allow to determine absorbance A = 1 - R - T

Then, as a function of energy, bandgap will be the energy where A takes off from zero.